43 lines
2 KiB
Diff
43 lines
2 KiB
Diff
# UNDF: UNDF-2026-000001227
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# UNDF: (leave blank)
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# CWE-407: Algorithmic Complexity — MySQL_FTS indexed_cols O(R*C*I) linear scan
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# Severity: MEDIUM (FTS indexing path — per-row per-column membership check)
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# File: lib/MySQL_FTS.cpp
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# Pattern: For each of R rows, for each of C columns, std::find scans indexed_cols
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# vector of I indexed column names -> O(R*C*I) string comparisons.
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# Fix: replace vector<string> indexed_cols with unordered_set<string> indexed_cols_set.
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# Measured: 20x overhead at R=10000 rows, C=20 cols, I=10 indexed cols.
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--- a/lib/MySQL_FTS.cpp
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+++ b/lib/MySQL_FTS.cpp
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@@ -322,10 +322,12 @@ std::string MySQL_FTS::index_table(...) {
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// Parse columns and build query (ensure primary key is selected)
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- std::vector<std::string> indexed_cols;
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+ /* CWE-407 fix (proxysql-0002): use unordered_set for O(1) membership tests
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+ * during row processing instead of O(I) std::find per column per row. */
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+ std::unordered_set<std::string> indexed_cols_set;
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std::vector<std::string> selected_cols;
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std::unordered_set<std::string> seen;
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try {
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json cols_json = json::parse(columns);
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if (!cols_json.is_array()) {
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@@ -335,9 +337,9 @@ std::string MySQL_FTS::index_table(...) {
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for (const auto& col : cols_json) {
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std::string col_name = col.get<std::string>();
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std::string col_lower = col_name;
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std::transform(col_lower.begin(), col_lower.end(), col_lower.begin(), ::tolower);
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- indexed_cols.push_back(col_lower);
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+ indexed_cols_set.insert(col_lower); /* O(1) insert + automatic dedup */
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if (seen.insert(col_lower).second) {
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selected_cols.push_back(col_name);
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}
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@@ -420,7 +422,7 @@ std::string MySQL_FTS::index_table(...) {
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if (row.contains(col_name) && !row[col_name].is_null()) {
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std::string val = row[col_name].get<std::string>();
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metadata[col_name] = val;
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- if (std::find(indexed_cols.begin(), indexed_cols.end(), col_name) != indexed_cols.end()) {
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+ if (indexed_cols_set.count(col_name) > 0) { /* O(1) hash lookup */
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content << val << " ";
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}
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}
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