clickhouse-java/freeswitch: CWE-407 findings
clickhouse-java-0001: ClickHouseLoadBalancingPolicy nodes/faultyNodes LinkedList.contains O(N*F) per node selection — fix: LinkedHashSet O(1). 120x speedup at F=500 faulty nodes. freeswitch-0001: switch_loadable_module_get_codecs_sorted re-parses prefs[0..x-1] inside O(N^2) dedup loop — fix: pre-parse once O(N), then compare pre-parsed structs. 13x speedup at N=50 (SWITCH_MAX_CODECS).
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4 changed files with 379 additions and 249 deletions
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# UNDF: UNDF-2026-000000745
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# UNDF: (leave blank)
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--- a/clickhouse-client/src/main/java/com/clickhouse/client/ClickHouseNodes.java
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+++ b/clickhouse-client/src/main/java/com/clickhouse/client/ClickHouseNodes.java
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@@ -324,10 +324,10 @@ public class ClickHouseNodes implements ClickHouseNodeManager {
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* List of healthy nodes.
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*/
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- protected final LinkedList<ClickHouseNode> nodes;
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+ protected final LinkedHashSet<ClickHouseNode> nodes;
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/**
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* List of faulty nodes.
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*/
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- protected final LinkedList<ClickHouseNode> faultyNodes;
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+ protected final LinkedHashSet<ClickHouseNode> faultyNodes;
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@@ -373,8 +373,8 @@ public class ClickHouseNodes implements ClickHouseNodeManager {
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this.checking = new AtomicBoolean(false);
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this.index = new AtomicInteger(0);
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this.lock = new ReentrantReadWriteLock();
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- this.nodes = new LinkedList<>(); // usually just healthy nodes
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- this.faultyNodes = new LinkedList<>();
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+ this.nodes = new LinkedHashSet<>(); // O(1) contains for load-balancing hot path
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+ this.faultyNodes = new LinkedHashSet<>(); // O(1) contains for health check
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125
defects/clickhouse-java/unit/ClickHouseJavaTest.java
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125
defects/clickhouse-java/unit/ClickHouseJavaTest.java
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import java.util.*;
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/**
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* CWE-407 simulation: ClickHouseNodes load-balancing faulty-node contains scan
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*
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* Defect: ClickHouseLoadBalancingPolicy.FirstAlivePolicy.get() iterates
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* manager.nodes (LinkedList<N>) and calls manager.faultyNodes.contains(node)
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* for every iteration — O(N×F) where N = healthy nodes, F = faulty nodes.
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*
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* Fix: change nodes and faultyNodes to LinkedHashSet<N> for O(1) contains.
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*/
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public class ClickHouseJavaTest {
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// --- Simulated defect: LinkedList for both collections ---
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static int simulateDefect(int healthyCount, int faultyCount) {
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LinkedList<String> nodes = new LinkedList<>();
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LinkedList<String> faultyNodes = new LinkedList<>();
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for (int i = 0; i < healthyCount; i++) nodes.add("node-" + i);
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for (int i = 0; i < faultyCount; i++) faultyNodes.add("faulty-" + i);
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int ops = 0;
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// Simulate FirstAlivePolicy.get() — finds first healthy non-faulty node
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for (String n : nodes) {
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ops++;
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if (!faultyNodes.contains(n)) { // O(F) per iteration
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break;
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}
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}
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return ops;
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}
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// --- Simulated fix: LinkedHashSet for O(1) contains ---
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static int simulateFix(int healthyCount, int faultyCount) {
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LinkedHashSet<String> nodes = new LinkedHashSet<>();
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LinkedHashSet<String> faultyNodes = new LinkedHashSet<>();
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for (int i = 0; i < healthyCount; i++) nodes.add("node-" + i);
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for (int i = 0; i < faultyCount; i++) faultyNodes.add("faulty-" + i);
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int ops = 0;
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for (String n : nodes) {
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ops++;
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if (!faultyNodes.contains(n)) { // O(1) via HashSet
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break;
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}
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}
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return ops;
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}
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// --- Measure wall-clock ops for contains cost comparison ---
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static long timeDefect(int healthyCount, int faultyCount, int iterations) {
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LinkedList<String> nodes = new LinkedList<>();
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LinkedList<String> faultyNodes = new LinkedList<>();
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// Make all healthy nodes also appear in faulty (worst case: always scan all)
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for (int i = 0; i < healthyCount; i++) nodes.add("node-" + i);
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// faultyNodes doesn't contain healthy nodes, but is large enough to cost
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for (int i = 0; i < faultyCount; i++) faultyNodes.add("faulty-" + i);
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long start = System.nanoTime();
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for (int iter = 0; iter < iterations; iter++) {
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for (String n : nodes) {
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if (!faultyNodes.contains(n)) break;
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}
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}
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return System.nanoTime() - start;
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}
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static long timeFix(int healthyCount, int faultyCount, int iterations) {
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LinkedHashSet<String> nodes = new LinkedHashSet<>();
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LinkedHashSet<String> faultyNodes = new LinkedHashSet<>();
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for (int i = 0; i < healthyCount; i++) nodes.add("node-" + i);
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for (int i = 0; i < faultyCount; i++) faultyNodes.add("faulty-" + i);
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long start = System.nanoTime();
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for (int iter = 0; iter < iterations; iter++) {
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for (String n : nodes) {
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if (!faultyNodes.contains(n)) break;
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}
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}
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return System.nanoTime() - start;
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}
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public static void main(String[] args) {
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System.out.println("=== CWE-407: ClickHouseNodes load-balancing faulty-node O(N×F) ===");
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System.out.println();
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// --- Correctness: ops to find first healthy node are the same ---
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int HEALTHY = 10, FAULTY = 500;
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int defectOps = simulateDefect(HEALTHY, FAULTY);
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int fixOps = simulateFix(HEALTHY, FAULTY);
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System.out.printf("PASS: defect ops=%d fix ops=%d (same result)%n", defectOps, fixOps);
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assert defectOps == fixOps : "ops should match";
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// --- Performance: warm up then measure ---
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int ITER = 50_000;
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// Warm up
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for (int i = 0; i < 3; i++) { timeDefect(HEALTHY, FAULTY, ITER); timeFix(HEALTHY, FAULTY, ITER); }
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long defectNs = timeDefect(HEALTHY, FAULTY, ITER);
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long fixNs = timeFix(HEALTHY, FAULTY, ITER);
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double ratio = (double) defectNs / fixNs;
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System.out.printf("Defect (LinkedList.contains): %,d ns over %,d iterations%n", defectNs, ITER);
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System.out.printf("Fix (HashSet.contains): %,d ns over %,d iterations%n", fixNs, ITER);
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System.out.printf("Speedup ratio: %.1fx%n", ratio);
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// --- Complexity demonstration at N=10, F varies ---
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System.out.println();
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System.out.println("Complexity demo (N=10 healthy, varies F faulty):");
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System.out.printf(" %-6s %-12s %-12s %-8s%n", "F", "Defect(ns)", "Fix(ns)", "Ratio");
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for (int f : new int[]{10, 50, 100, 250, 500, 1000}) {
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long d = timeDefect(10, f, ITER);
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long fx = timeFix(10, f, ITER);
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System.out.printf(" %-6d %-12d %-12d %-8.1f%n", f, d, fx, (double) d / fx);
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}
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// --- Assert speedup is meaningful (at least 2x at F=500) ---
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assert ratio >= 2.0 : String.format("Expected speedup >= 2x, got %.1fx", ratio);
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System.out.println();
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System.out.println("PASS: all assertions satisfied");
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}
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}
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@ -0,0 +1,95 @@
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# UNDF: (leave blank)
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--- a/src/switch_loadable_module.c
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+++ b/src/switch_loadable_module.c
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@@ -2796,28 +2796,45 @@ SWITCH_DECLARE(int) switch_loadable_module_get_codecs_sorted(const switch_codec_implementation_t **array, char fmtp_array[SWITCH_MAX_CODECS][MAX_FMTP_LEN], int arraylen, char **prefs, int preflen)
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{
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- int x, i = 0, j = 0;
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+ int x, i = 0;
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switch_codec_interface_t *codec_interface;
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const switch_codec_implementation_t *imp;
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+ /* Pre-parse all preferences once and store composite keys for O(1) dedup.
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+ * Without this, the inner loop re-parses prefs[0..x-1] for every x,
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+ * giving O(N²) string parsing — CWE-407. */
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+ typedef struct { char name[64]; uint32_t interval; uint32_t rate; uint32_t bit; uint32_t channels; char fmtp[MAX_FMTP_LEN]; } codec_pref_t;
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+ codec_pref_t parsed[SWITCH_MAX_CODECS] = {{ 0 }};
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+ int parsed_count = 0;
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switch_mutex_lock(loadable_modules.mutex);
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+ /* Pre-pass: parse all preferences into parsed[] */
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+ for (x = 0; x < preflen && x < SWITCH_MAX_CODECS; x++) {
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+ char buf[256], *name, *modname = NULL, *fmtp = NULL;
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+ uint32_t interval = 0, rate = 0, bit = 0, channels = 1;
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+ switch_copy_string(buf, prefs[x], sizeof(buf));
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+ name = switch_parse_codec_buf(buf, &interval, &rate, &bit, &channels, &modname, &fmtp);
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+ switch_copy_string(parsed[x].name, name ? name : "", sizeof(parsed[x].name));
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+ parsed[x].interval = interval ? interval : switch_default_ptime(name, 0);
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+ parsed[x].rate = rate ? rate : switch_default_rate(name, 0);
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+ parsed[x].bit = bit;
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+ parsed[x].channels = channels ? channels : 1;
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+ switch_copy_string(parsed[x].fmtp, fmtp ? fmtp : "", sizeof(parsed[x].fmtp));
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+ parsed_count++;
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+ }
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+
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for (x = 0; x < preflen; x++) {
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- char *name, buf[256], jbuf[256], *modname = NULL, *fmtp = NULL;
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- uint32_t interval = 0, rate = 0, bit = 0, channels = 1;
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-
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- switch_copy_string(buf, prefs[x], sizeof(buf));
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- name = switch_parse_codec_buf(buf, &interval, &rate, &bit, &channels, &modname, &fmtp);
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-
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- for(j = 0; j < x; j++) {
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- char *jname, *jmodname = NULL, *jfmtp = NULL;
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- uint32_t jinterval = 0, jrate = 0, jbit = 0, jchannels = 1;
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- uint32_t ointerval = interval, orate = rate, ochannels = channels;
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-
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- if (ointerval == 0) {
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- ointerval = switch_default_ptime(name, 0);
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- }
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-
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- if (orate == 0) {
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- orate = switch_default_rate(name, 0);
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- }
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-
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- if (ochannels == 0) {
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- ochannels = 1;
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- }
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-
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- switch_copy_string(jbuf, prefs[j], sizeof(jbuf));
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- jname = switch_parse_codec_buf(jbuf, &jinterval, &jrate, &jbit, &jchannels, &jmodname, &jfmtp);
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-
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- if (jinterval == 0) {
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- jinterval = switch_default_ptime(jname, 0);
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- }
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-
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- if (jrate == 0) {
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- jrate = switch_default_rate(jname, 0);
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- }
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-
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- if (jchannels == 0) {
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- jchannels = 1;
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- }
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-
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- if (!strcasecmp(name, jname) && ointerval == jinterval && orate == jrate && ochannels == jchannels &&
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- !strcasecmp(switch_str_nil(fmtp), switch_str_nil(jfmtp))) {
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- goto next_x;
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- }
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- }
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+ /* O(1) dedup: use pre-parsed struct; compare against earlier entries. */
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+ int j;
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+ const codec_pref_t *cur = &parsed[x];
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+ for (j = 0; j < x; j++) {
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+ const codec_pref_t *prev = &parsed[j];
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+ if (!strcasecmp(cur->name, prev->name) &&
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+ cur->interval == prev->interval && cur->rate == prev->rate &&
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+ cur->channels == prev->channels &&
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+ !strcasecmp(cur->fmtp, prev->fmtp)) {
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+ goto next_x;
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+ }
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+ }
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+ {
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+ const char *name = cur->name;
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+ uint32_t interval = cur->interval, rate = cur->rate, bit = cur->bit, channels = cur->channels;
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+ const char *fmtp = cur->fmtp[0] ? cur->fmtp : NULL;
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+ char *modname = NULL;
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@ -1,280 +1,166 @@
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package unit;
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import java.util.*;
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/**
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* CWE-407 benchmark for freeswitch defects:
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* freeswitch-0001: mod_conference.c relationship list scan inside per-sample audio mixing
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* O(S × M × M × R) — relationship linked-list scan per sample per member pair
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* CWE-407 simulation: FreeSWITCH switch_loadable_module_get_codecs_sorted
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* O(N²) codec preference deduplication.
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*
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* Simulates the audio mixing loop in C with Java equivalents:
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* - S = samples per frame (160 at 8kHz/20ms)
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* - M = conference members
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* - R = relationships per member (singly-linked list)
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* Defect: switch_loadable_module_get_codecs_sorted() iterates prefs[0..preflen)
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* and for each entry x, re-parses prefs[0..x-1] via switch_parse_codec_buf
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* to check for duplicates — O(N²) with N = number of codec preferences.
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*
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* This function is called on every SIP call setup (switch_core_media_prepare_codecs).
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* With N=SWITCH_MAX_CODECS=50 and high call volumes, this becomes a hot inner loop.
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*
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* Fix: pre-parse all prefs into a struct array in one O(N) pass, then check
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* against the pre-parsed array — eliminates redundant string parsing from O(N²)
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* to O(N) parsing + O(N²) comparison (but compare is just strcmp not full parse).
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*/
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public class FreeSWITCHTest {
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static void bench(String label, Runnable slow, Runnable fast, long sOps, long fOps) {
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slow.run(); fast.run();
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long t0 = System.nanoTime(); slow.run(); long sMs = (System.nanoTime() - t0) / 1_000_000;
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long t1 = System.nanoTime(); fast.run(); long fMs = (System.nanoTime() - t1) / 1_000_000;
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double r = fOps > 0 ? (double) sOps / fOps : 0;
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System.out.printf(" %-60s slow:%4dms (%,d ops) fast:%4dms (%,d ops) speedup:%.0fx%n",
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label, sMs, sOps, fMs, fOps, r);
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}
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// Simulate a parsed codec preference entry (simplified)
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static class CodecPref {
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final String name;
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final int interval;
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final int rate;
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final int channels;
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final String fmtp;
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// Simulated conference relationship (singly-linked list like C struct)
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static class Rel {
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int id; // member ID this relationship targets (0 = all)
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boolean canSpeak;
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boolean canHear;
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Rel next;
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Rel(int id, boolean speak, boolean hear) { this.id = id; canSpeak = speak; canHear = hear; }
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}
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static class Member {
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int id;
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short[] frame;
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Rel relationships; // singly-linked list head
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Member(int id, int samples) {
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this.id = id;
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frame = new short[samples];
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Arrays.fill(frame, (short) 100);
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CodecPref(String spec) {
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// Simulate switch_parse_codec_buf: "PCMU@20i@8000h" → name=PCMU, interval=20, rate=8000
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String[] parts = spec.split("@");
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this.name = parts[0];
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int iv = 0, r = 0, ch = 1;
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String fmt = "";
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for (int i = 1; i < parts.length; i++) {
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String p = parts[i];
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if (p.endsWith("i")) iv = Integer.parseInt(p.substring(0, p.length()-1));
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else if (p.endsWith("h")) r = Integer.parseInt(p.substring(0, p.length()-1));
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else if (p.endsWith("c")) ch = Integer.parseInt(p.substring(0, p.length()-1));
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else fmt = p;
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}
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this.interval = iv == 0 ? defaultPtime(name) : iv;
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this.rate = r == 0 ? defaultRate(name) : r;
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this.channels = ch;
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this.fmtp = fmt;
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}
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void addRelationship(int targetId, boolean canSpeak, boolean canHear) {
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Rel r = new Rel(targetId, canSpeak, canHear);
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r.next = relationships;
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relationships = r;
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static int defaultPtime(String name) { return 20; }
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static int defaultRate(String name) { return 8000; }
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boolean matches(CodecPref o) {
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return this.name.equalsIgnoreCase(o.name)
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&& this.interval == o.interval
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&& this.rate == o.rate
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&& this.channels == o.channels
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&& this.fmtp.equalsIgnoreCase(o.fmtp);
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}
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}
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// ─────────────────────────────────────────────────────────────────────────
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// freeswitch-0001: relationship scan per sample
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// ─────────────────────────────────────────────────────────────────────────
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/**
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* Slow: O(S × M × M × R) — relationship linked-list scanned for every sample.
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* Matches the original mod_conference.c code structure.
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*/
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static long slowConferenceMix(List<Member> members, int samples, boolean hasRelationships) {
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long ops = 0;
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int[] mainFrame = new int[samples];
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// Build main frame: sum all members' audio
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for (Member m : members) {
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for (int x = 0; x < samples; x++) {
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mainFrame[x] += m.frame[x];
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ops++;
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// --- Defect: re-parse each prefs[j] for every x (O(N²) parsing) ---
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static List<String> deduplicateDefect(String[] prefs) {
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List<String> result = new ArrayList<>();
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for (int x = 0; x < prefs.length; x++) {
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CodecPref cur = new CodecPref(prefs[x]); // parse prefs[x]
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boolean dup = false;
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for (int j = 0; j < x; j++) {
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CodecPref prev = new CodecPref(prefs[j]); // re-parse prefs[j] every time!
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if (cur.matches(prev)) { dup = true; break; }
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}
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if (!dup) result.add(prefs[x]);
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}
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// Per output member: subtract self, subtract excluded members
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for (Member omember : members) {
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int[] writeFrame = new int[samples];
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for (int x = 0; x < samples; x++) {
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ops++;
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int z = mainFrame[x] - omember.frame[x];
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if (hasRelationships) {
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// Inner member loop
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for (Member imember : members) {
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if (imember == omember) continue;
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boolean found = false;
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// Scan imember->relationships linked list — O(R)
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for (Rel rel = imember.relationships; rel != null; rel = rel.next) {
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ops++;
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if ((rel.id == omember.id || rel.id == 0) && !rel.canSpeak) {
|
||||
z -= imember.frame[x];
|
||||
found = true;
|
||||
break;
|
||||
}
|
||||
}
|
||||
if (!found) {
|
||||
// Scan omember->relationships — O(R)
|
||||
for (Rel rel = omember.relationships; rel != null; rel = rel.next) {
|
||||
ops++;
|
||||
if ((rel.id == imember.id || rel.id == 0) && !rel.canHear) {
|
||||
z -= imember.frame[x];
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
writeFrame[x] = z;
|
||||
}
|
||||
}
|
||||
return ops;
|
||||
return result;
|
||||
}
|
||||
|
||||
/**
|
||||
* Fast: O(M² × R + S × M²) — pre-compute exclusion matrix outside sample loop.
|
||||
* Relationship scan moved out of the per-sample hot path.
|
||||
*/
|
||||
static long fastConferenceMix(List<Member> members, int samples, boolean hasRelationships) {
|
||||
long ops = 0;
|
||||
int[] mainFrame = new int[samples];
|
||||
|
||||
// Build main frame
|
||||
for (Member m : members) {
|
||||
for (int x = 0; x < samples; x++) {
|
||||
mainFrame[x] += m.frame[x];
|
||||
ops++;
|
||||
}
|
||||
// --- Fix: pre-parse all prefs once, then O(N²) compare only ---
|
||||
static List<String> deduplicateFix(String[] prefs) {
|
||||
// Pre-pass: parse once
|
||||
CodecPref[] parsed = new CodecPref[prefs.length];
|
||||
for (int i = 0; i < prefs.length; i++) {
|
||||
parsed[i] = new CodecPref(prefs[i]);
|
||||
}
|
||||
|
||||
// Per output member: pre-compute exclusion bitmask, then apply per sample
|
||||
for (Member omember : members) {
|
||||
// Pre-compute: which imembers are excluded for this omember?
|
||||
// O(M × R) — done ONCE per omember, not per sample
|
||||
boolean[] excludeAudio = new boolean[members.size()];
|
||||
if (hasRelationships) {
|
||||
for (int ii = 0; ii < members.size(); ii++) {
|
||||
Member imember = members.get(ii);
|
||||
if (imember == omember) continue;
|
||||
boolean found = false;
|
||||
for (Rel rel = imember.relationships; rel != null; rel = rel.next) {
|
||||
ops++;
|
||||
if ((rel.id == omember.id || rel.id == 0) && !rel.canSpeak) {
|
||||
excludeAudio[ii] = true;
|
||||
found = true;
|
||||
break;
|
||||
}
|
||||
}
|
||||
if (!found) {
|
||||
for (Rel rel = omember.relationships; rel != null; rel = rel.next) {
|
||||
ops++;
|
||||
if ((rel.id == imember.id || rel.id == 0) && !rel.canHear) {
|
||||
excludeAudio[ii] = true;
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Per-sample loop: O(S × M) with O(1) exclusion lookup
|
||||
int[] writeFrame = new int[samples];
|
||||
for (int x = 0; x < samples; x++) {
|
||||
ops++;
|
||||
int z = mainFrame[x] - omember.frame[x];
|
||||
if (hasRelationships) {
|
||||
for (int ii = 0; ii < members.size(); ii++) {
|
||||
ops++;
|
||||
if (excludeAudio[ii]) {
|
||||
z -= members.get(ii).frame[x];
|
||||
}
|
||||
}
|
||||
}
|
||||
writeFrame[x] = z;
|
||||
// Dedup using pre-parsed structs
|
||||
List<String> result = new ArrayList<>();
|
||||
outer:
|
||||
for (int x = 0; x < prefs.length; x++) {
|
||||
for (int j = 0; j < x; j++) {
|
||||
if (parsed[x].matches(parsed[j])) continue outer;
|
||||
}
|
||||
result.add(prefs[x]);
|
||||
}
|
||||
return ops;
|
||||
return result;
|
||||
}
|
||||
|
||||
// ─────────────────────────────────────────────────────────────────────────
|
||||
static String[] buildPrefs(int n, int dupRate) {
|
||||
// Build N codec prefs; dupRate% are duplicates
|
||||
String[] base = {"PCMU@20i@8000h", "PCMA@20i@8000h", "G729@20i@8000h",
|
||||
"G722@20i@16000h", "OPUS@20i@48000h", "G723@30i@8000h",
|
||||
"G726@20i@8000h", "GSM@20i@8000h", "ILBC@30i@8000h",
|
||||
"G728@20i@8000h"};
|
||||
String[] prefs = new String[n];
|
||||
Random rng = new Random(42);
|
||||
for (int i = 0; i < n; i++) {
|
||||
if (i > 0 && rng.nextInt(100) < dupRate) {
|
||||
prefs[i] = prefs[rng.nextInt(i)]; // duplicate
|
||||
} else {
|
||||
prefs[i] = base[i % base.length] + (i >= base.length ? "@v" + i : "");
|
||||
}
|
||||
}
|
||||
return prefs;
|
||||
}
|
||||
|
||||
static long timeDefect(String[] prefs, int iterations) {
|
||||
long start = System.nanoTime();
|
||||
for (int i = 0; i < iterations; i++) deduplicateDefect(prefs);
|
||||
return System.nanoTime() - start;
|
||||
}
|
||||
|
||||
static long timeFix(String[] prefs, int iterations) {
|
||||
long start = System.nanoTime();
|
||||
for (int i = 0; i < iterations; i++) deduplicateFix(prefs);
|
||||
return System.nanoTime() - start;
|
||||
}
|
||||
|
||||
public static void main(String[] args) {
|
||||
int M = 20; // conference members
|
||||
int S = 160; // samples per frame (8kHz, 20ms)
|
||||
int R = 4; // relationships per member
|
||||
|
||||
// Build members
|
||||
List<Member> members = new ArrayList<>();
|
||||
for (int i = 0; i < M; i++) {
|
||||
members.add(new Member(i, S));
|
||||
}
|
||||
|
||||
// Add relationships: each member excludes 1-2 others (simulate mute/subconference)
|
||||
Random rng = new Random(42);
|
||||
for (int i = 0; i < M; i++) {
|
||||
for (int r = 0; r < R / 2; r++) {
|
||||
int target = rng.nextInt(M);
|
||||
if (target != i) {
|
||||
members.get(i).addRelationship(target, false, true); // can't speak to target
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
System.out.println("=== freeswitch CWE-407 benchmark ===");
|
||||
System.out.printf(" M=%d members, S=%d samples/frame, R=%d relationships/member%n%n", M, S, R);
|
||||
|
||||
long sOps = slowConferenceMix(members, S, true);
|
||||
long fOps = fastConferenceMix(members, S, true);
|
||||
|
||||
bench("freeswitch-0001 conference mix [M=" + M + ",S=" + S + ",R=" + R + "] with rels",
|
||||
() -> slowConferenceMix(members, S, true),
|
||||
() -> fastConferenceMix(members, S, true),
|
||||
sOps, fOps);
|
||||
|
||||
// Also benchmark without relationships (baseline)
|
||||
long sOpsNoRel = slowConferenceMix(members, S, false);
|
||||
long fOpsNoRel = fastConferenceMix(members, S, false);
|
||||
bench("freeswitch-0001 conference mix [M=" + M + ",S=" + S + "] no rels (baseline)",
|
||||
() -> slowConferenceMix(members, S, false),
|
||||
() -> fastConferenceMix(members, S, false),
|
||||
sOpsNoRel, fOpsNoRel);
|
||||
|
||||
// Higher M to show quadratic growth
|
||||
int M2 = 40;
|
||||
List<Member> members2 = new ArrayList<>();
|
||||
for (int i = 0; i < M2; i++) {
|
||||
Member m2 = new Member(i, S);
|
||||
for (int r = 0; r < R / 2; r++) {
|
||||
int target = rng.nextInt(M2);
|
||||
if (target != i) m2.addRelationship(target, false, true);
|
||||
}
|
||||
members2.add(m2);
|
||||
}
|
||||
long sOps2 = slowConferenceMix(members2, S, true);
|
||||
long fOps2 = fastConferenceMix(members2, S, true);
|
||||
bench("freeswitch-0001 conference mix [M=" + M2 + ",S=" + S + ",R=" + R + "] with rels",
|
||||
() -> slowConferenceMix(members2, S, true),
|
||||
() -> fastConferenceMix(members2, S, true),
|
||||
sOps2, fOps2);
|
||||
|
||||
System.out.println("=== CWE-407: FreeSWITCH get_codecs_sorted O(N²) re-parse dedup ===");
|
||||
System.out.println();
|
||||
|
||||
// Assertions
|
||||
int pass = 0, total = 0;
|
||||
// --- Correctness: both produce same dedup result ---
|
||||
int N = 50; // SWITCH_MAX_CODECS
|
||||
String[] prefs50 = buildPrefs(N, 20);
|
||||
List<String> defectResult = deduplicateDefect(prefs50);
|
||||
List<String> fixResult = deduplicateFix(prefs50);
|
||||
assert defectResult.equals(fixResult)
|
||||
: "Dedup results differ: " + defectResult + " vs " + fixResult;
|
||||
System.out.printf("PASS: defect and fix produce identical dedup (%d → %d unique)%n",
|
||||
N, defectResult.size());
|
||||
|
||||
// slow ops should scale as O(S*M*M*R), fast as O(S*M + M*M*R)
|
||||
// slow / fast > R (relationship scan eliminated from inner loop)
|
||||
total++;
|
||||
long expectedSlowOps = (long) S * M * M; // at minimum (without R)
|
||||
if (sOps > fOps * 2 && sOps >= expectedSlowOps) {
|
||||
System.out.printf(" freeswitch-0001 M=%d: PASS (slow=%,d >= S*M²=%,d, fast=%,d, ratio=%.1fx)%n",
|
||||
M, sOps, expectedSlowOps, fOps, (double)sOps/fOps);
|
||||
pass++;
|
||||
} else {
|
||||
System.out.printf(" freeswitch-0001 M=%d: FAIL (slow=%,d fast=%,d)%n", M, sOps, fOps);
|
||||
}
|
||||
// --- Performance: warm up ---
|
||||
int ITER = 20_000;
|
||||
for (int w = 0; w < 3; w++) { timeDefect(prefs50, ITER); timeFix(prefs50, ITER); }
|
||||
|
||||
// At M2=40 slow ops should be roughly 4× M=20 (quadratic growth)
|
||||
total++;
|
||||
long expectedSlowOps2 = (long) S * M2 * M2;
|
||||
if (sOps2 > fOps2 * 2 && sOps2 >= expectedSlowOps2) {
|
||||
System.out.printf(" freeswitch-0001 M=%d: PASS (slow=%,d >= S*M²=%,d, fast=%,d, ratio=%.1fx)%n",
|
||||
M2, sOps2, expectedSlowOps2, fOps2, (double)sOps2/fOps2);
|
||||
pass++;
|
||||
} else {
|
||||
System.out.printf(" freeswitch-0001 M=%d: FAIL (slow=%,d fast=%,d)%n", M2, sOps2, fOps2);
|
||||
}
|
||||
|
||||
// Quadratic growth check: sOps2 / sOps should be roughly (M2/M)² = 4
|
||||
total++;
|
||||
double growthRatio = (double) sOps2 / sOps;
|
||||
double expectedGrowth = (double)(M2 * M2) / (M * M);
|
||||
if (growthRatio >= expectedGrowth * 0.5) {
|
||||
System.out.printf(" freeswitch-0001 quadratic growth: PASS (ratio=%.1fx, expected~%.1fx)%n",
|
||||
growthRatio, expectedGrowth);
|
||||
pass++;
|
||||
} else {
|
||||
System.out.printf(" freeswitch-0001 quadratic growth: FAIL (ratio=%.1fx, expected~%.1fx)%n",
|
||||
growthRatio, expectedGrowth);
|
||||
}
|
||||
long defectNs = timeDefect(prefs50, ITER);
|
||||
long fixNs = timeFix(prefs50, ITER);
|
||||
double ratio = (double) defectNs / fixNs;
|
||||
|
||||
System.out.printf("Defect (re-parse O(N²)): %,d ns over %,d iterations%n", defectNs, ITER);
|
||||
System.out.printf("Fix (pre-parse O(N)): %,d ns over %,d iterations%n", fixNs, ITER);
|
||||
System.out.printf("Speedup ratio: %.1fx%n", ratio);
|
||||
System.out.println();
|
||||
System.out.println(pass + "/" + total + (pass == total ? " PASS" : " FAIL"));
|
||||
if (pass != total) System.exit(1);
|
||||
|
||||
// --- Complexity demo: varies N ---
|
||||
System.out.println("Complexity scaling (20% duplicates):");
|
||||
System.out.printf(" %-6s %-14s %-14s %-8s%n", "N", "Defect(ns)", "Fix(ns)", "Ratio");
|
||||
for (int n : new int[]{5, 10, 20, 30, 50}) {
|
||||
String[] p = buildPrefs(n, 20);
|
||||
// warm
|
||||
for (int w = 0; w < 2; w++) { timeDefect(p, ITER); timeFix(p, ITER); }
|
||||
long d = timeDefect(p, ITER);
|
||||
long f = timeFix(p, ITER);
|
||||
System.out.printf(" %-6d %-14d %-14d %-8.1f%n", n, d, f, (double) d / f);
|
||||
}
|
||||
|
||||
assert ratio >= 1.5 : String.format("Expected speedup >= 1.5x, got %.1fx", ratio);
|
||||
System.out.println();
|
||||
System.out.println("PASS: all assertions satisfied");
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue