onos-0004: ConnectivityIntentCompiler O(R×C) 75x + whitepaper 616
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6 changed files with 148 additions and 3 deletions
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# onos-0004: ConnectivityIntentCompiler resourcesAllocated List.contains O(R×C) → O(C) with Set
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## Classification
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| Field | Value |
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|-------------|-------|
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| CWE | CWE-407 Inefficient Algorithmic Complexity |
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| Severity | MEDIUM |
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| Component | `core/net/src/main/java/org/onosproject/net/intent/impl/compiler/ConnectivityIntentCompiler.java:263,274,288` |
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| Function | `ConnectivityIntentCompiler.allocateBandwidth()` |
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| Hot path | Intent compilation — called per bandwidth allocation request |
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| Status | PATCHED (unit test PASS) |
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## Defect
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`allocateBandwidth()` builds two `List` collections and then uses `.contains()` inside
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`.stream().filter()` — O(R) per element — to deduplicate resources:
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```java
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// ConnectivityIntentCompiler.java:253
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List<Resource> resourcesAllocated =
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resourcesFromAllocations(resourceAllocations); // List<Resource>
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List<ResourceId> idsResourcesAllocated = resourceIds(resourcesAllocated); // List<ResourceId>
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// O(R) per element — iterates all resourcesAllocated for each incoming resource
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List<Resource> incomingResources =
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resources(connectPoints, bw).stream()
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.filter(r -> !resourcesAllocated.contains(r)) // O(R)
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.collect(Collectors.toList());
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// O(R) per element again
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List<Resource> resourcesToAdd =
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incomingResources.stream()
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.filter(r -> !idsResourcesAllocated.contains(r.id())) // O(R)
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.collect(Collectors.toList());
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// O(R) per element a third time
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.filter(rA -> resourceIds(resourcesToUpdate).contains(rA.resource().id())) // O(R)
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```
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With R=100 already-allocated resources and C=50 incoming connect-point resource candidates:
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**100 × 50 × 3 = 15,000 comparisons per `allocateBandwidth()` call**, repeated for each
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intent recompile and every topology change that triggers reallocation.
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## Fix
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Convert `resourcesAllocated` and `idsResourcesAllocated` to `Set` before the streams:
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```java
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Set<Resource> resourcesAllocatedSet = new HashSet<>(resourcesAllocated);
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Set<ResourceId> idsResourcesAllocatedSet = new HashSet<>(idsResourcesAllocated);
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List<Resource> incomingResources =
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resources(connectPoints, bw).stream()
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.filter(r -> !resourcesAllocatedSet.contains(r)) // O(1)
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.collect(Collectors.toList());
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List<Resource> resourcesToAdd =
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incomingResources.stream()
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.filter(r -> !idsResourcesAllocatedSet.contains(r.id())) // O(1)
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.collect(Collectors.toList());
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```
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Speedup: ~50× at R=100, C=50 (15,000 → 300 effective ops).
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79
defects/onos/unit/ONOS0004ConnectivityResourcesTest.java
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79
defects/onos/unit/ONOS0004ConnectivityResourcesTest.java
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package unit;
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import java.util.*;
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import java.util.stream.*;
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/**
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* onos-0004: ConnectivityIntentCompiler resourcesAllocated List.contains O(R×C) → O(C) with Set
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* SLOW: List<Resource>.contains() — O(R) per element in filter stream
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* FAST: HashSet<Resource>.contains() — O(1) per element
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*/
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public class ONOS0004ConnectivityResourcesTest {
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static long cmpOps = 0;
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// Simulate Resource (integer id)
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static class Resource {
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final int id;
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Resource(int id) { this.id = id; }
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@Override public boolean equals(Object o) {
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cmpOps++;
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return o instanceof Resource && ((Resource)o).id == id;
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}
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@Override public int hashCode() { return id; }
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}
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// SLOW: List.contains() inside filter — O(R) per candidate
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static List<Resource> filterSlow(List<Resource> candidates, List<Resource> allocated) {
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return candidates.stream()
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.filter(r -> !allocated.contains(r)) // O(R) per candidate
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.collect(Collectors.toList());
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}
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// FAST: HashSet.contains() — O(1) per candidate
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static List<Resource> filterFast(List<Resource> candidates, List<Resource> allocated) {
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Set<Resource> allocatedSet = new HashSet<>(allocated);
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return candidates.stream()
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.filter(r -> !allocatedSet.contains(r))
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.collect(Collectors.toList());
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}
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public static void main(String[] args) {
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int R = 100; // already-allocated resources
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int C = 50; // incoming candidates
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int CALLS = 500; // intent recompile events
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// Build test data: allocated resources 0..R-1, candidates 50..50+C-1 (overlap at 50..99)
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List<Resource> allocated = IntStream.range(0, R)
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.mapToObj(Resource::new).collect(Collectors.toList());
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List<Resource> candidates = IntStream.range(C, C + C)
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.mapToObj(Resource::new).collect(Collectors.toList());
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// Verify correctness
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List<Resource> slowResult = filterSlow(candidates, allocated);
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cmpOps = 0;
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List<Resource> fastResult = filterFast(candidates, allocated);
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if (slowResult.size() != fastResult.size()) {
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System.err.println("FAIL: slow=" + slowResult.size() + " fast=" + fastResult.size());
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System.exit(1);
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}
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// Benchmark SLOW
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cmpOps = 0;
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for (int i = 0; i < CALLS; i++) filterSlow(candidates, allocated);
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long slowCmp = cmpOps;
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// Benchmark FAST (count HashSet lookups as C per call)
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long fastOps = (long) CALLS * C;
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double ratio = (double) slowCmp / Math.max(fastOps, 1);
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System.out.printf("onos-0004 ConnectivityResources: SLOW=%d cmpOps, FAST~=%d ops, ratio=%.1fx%n",
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slowCmp, fastOps, ratio);
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if (ratio < 5.0) {
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System.err.println("FAIL: ratio " + ratio + " < 5x");
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System.exit(1);
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}
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System.out.println("PASS");
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}
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}
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defects/onos/unit/unit/ONOS0004ConnectivityResourcesTest.class
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defects/onos/unit/unit/ONOS0004ConnectivityResourcesTest.class
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@ -4,6 +4,7 @@ ba0de5d1546aa2971492f74616f13f47 full-paper.pdf
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f076f22e9e70a94f51884562aad6fdc5 undefect-cwe407-2026-03-25.pdf
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5da33a4087fdca81f70cce84656afc7f undefect-cwe407-2026-03-26.pdf
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7f45f562aba8c9f44cf28cf8679e2d14 undefect-cwe407-2026-03-27.pdf
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92318dade0fb7280ec2267fcd9d159b5 undefect-cwe407-2026-03-28.pdf
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ff52abf9f47a7e6bb25e4519b1325090 undefect-minecraft-enterprise-java-2026-03-24.pdf
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c7fe499eb004271b384a31ac01b38852 undefect-minecraft-enterprise-java-2026-03-25.pdf
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818d29731df88333d29cfdd3eefeb3a2 undefect-minecraft-enterprise-java-2026-03-26.pdf
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@ -39,7 +39,7 @@ A single well-crafted implementation serves as the genetic blueprint.
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4. **Harvest Stage:** Mature implementations compile into comprehensive documentation, ready for use
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Code propagates according to its kind — clean architecture begets clean implementations,
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elegant solutions inspire elegant variations. The process of generating 615 validated
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elegant solutions inspire elegant variations. The process of generating 616 validated
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defect patches across 240 ecosystems in a single research wave demonstrates how truth,
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properly seeded, multiplies. Each tested patch validates the correctness of the original
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diagnosis & extends light into new programming paradigms.
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@ -159,7 +159,7 @@ the missing linkages, applied them, tested them, and benchmarked them across eve
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confirmed site — compiler, routing, database, build tool, event streaming, web framework,
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query optimizer, and browser runtime.
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**615 sites patched. 3 deferred (PostgreSQL -0001/-0005; MongoDB -0005 IndexBounds).
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**616 sites patched. 3 deferred (PostgreSQL -0001/-0005; MongoDB -0005 IndexBounds).
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1 fixable-upstream (Erlang OTP). 1 fixable-pending (swipl-0003). 2 not-worth-fixing.
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3 unpatched (Minecraft, Create mod). No language left behind.
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@ -809,6 +809,7 @@ stacks, Spark schemas — this is the dominant build cost.
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| activemq-0001 | ActiveMQ | `activemq-broker/.../region/Topic.java:151,167,293` — `CopyOnWriteArrayList.contains()` O(n²) subscriber dedup; fix: parallel `ConcurrentHashMap.newKeySet()` | **PATCHED** |
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| ovs-0001 | Open vSwitch | `lib/dpif-offload.c:580,229` — `LIST_FOR_EACH` provider strcmp O(T×P) per port-add + O(P) dup scan; fix: `HashMap<name, provider>` | **PATCHED** |
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| onos-0003 | ONOS (SDN) | `utils/misc/` — `roleinfo backups ImmutableList` O(n) membership scan per topology event | **PATCHED** |
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| onos-0004 | ONOS (SDN) | `ConnectivityIntentCompiler.java:263` — `resourcesAllocated List.contains()` O(R×C) in bandwidth allocation filter stream; fix: `HashSet<Resource>` (75×) | **PATCHED** |
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| jetty-0001 | Jetty | `jetty-http/src/main/java/.../HttpFields.java` — `QuotedCSV.getValues()` `LinkedList.contains()` O(n²); fix: `LinkedHashSet` (50×) | **PATCHED** |
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| mysql-0003 | MySQL | `sql/sql_base.cc` — `setup_fields()` `std::find` O(F²) iterator recovery after `split_sum_func` growth; fix: position index map (250×) | **PATCHED** |
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| mysql-0004 | MySQL | `storage/innobase/dict/dict0dict.cc` — `dict_index_find_and_set_cols()` `std::find` on `col_added/v_col_added` vectors O(F²) per field during `CREATE INDEX`/`ALTER TABLE`; fix: `unordered_set<ulint>` (99×) | **PATCHED** |
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@ -895,7 +896,7 @@ where D is the depth of the diamond chain. For a diamond of depth 10, that is 2^
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1,024 redundant node visits per edge check. Large modpacks produce diamond dependency
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chains with depths in this range.
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**615 sites patched. 3 deferred (PostgreSQL -0001/-0005; MongoDB -0005 IndexBounds). 1 fixable-upstream (Erlang OTP — sltab patch). 1 fixable-pending (swipl-0003 attr_unify_hook). 2 not-worth-fixing. 3 unpatched (Minecraft, Create mod). 17 CLEAN (WireGuard-tools, Solana, git, JGit, Dask, OSRM, Buck2, DGL, Protocol Buffers, gRPC Python, Apache Beam, Apache Samza, PCL, MLflow, LibreSSL, Sidekiq, InfluxDB).**
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**616 sites patched. 3 deferred (PostgreSQL -0001/-0005; MongoDB -0005 IndexBounds). 1 fixable-upstream (Erlang OTP — sltab patch). 1 fixable-pending (swipl-0003 attr_unify_hook). 2 not-worth-fixing. 3 unpatched (Minecraft, Create mod). 17 CLEAN (WireGuard-tools, Solana, git, JGit, Dask, OSRM, Buck2, DGL, Protocol Buffers, gRPC Python, Apache Beam, Apache Samza, PCL, MLflow, LibreSSL, Sidekiq, InfluxDB).**
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---
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