github_mirrors/vectorscan
3
0
Fork 1
mirror of https://github.com/VectorCamp/vectorscan.git synced 2025-09-29 19:24:25 +03:00
Code Issues Packages Projects Releases Wiki Activity

ng_fuzzy: apply a resource limit to vertex count

Browse Source
This commit is contained in:
Justin Viiret
2017-03-08 11:36:24 +11:00
committed by Matthew Barr
parent ffab97ca8c
commit 533fcf383d
3 changed files with 18 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
src/nfagraph/ng_fuzzy.cpp
View File

@@ -665,13 +665,23 @@ void validate_fuzzy_compile(const NGHolder &g, u32 edit_distance, bool utf8,
}
}
void make_fuzzy(NGHolder &g, u32 edit_distance, UNUSED const Grey &grey) {
void make_fuzzy(NGHolder &g, u32 edit_distance, const Grey &grey) {
if (edit_distance == 0) {
return;
}
assert(grey.allowApproximateMatching);
assert(grey.maxEditDistance >= edit_distance);
ShadowGraph sg(g, edit_distance);
sg.fuzz_graph();
// For safety, enforce limit on actual vertex count.
if (num_vertices(g) > grey.limitApproxMatchingVertices) {
DEBUG_PRINTF("built %zu vertices > limit of %u\n", num_vertices(g),
grey.limitApproxMatchingVertices);
throw ResourceLimitError();
}
}
}
} // namespace ue2