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IconCache: Check entry lengths before allocating when loading the cache

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The key was resized before its length was checked, and the data length
wasn't checked at all, so a corrupt icon.cache could make a multi-GB
allocation and crash every launch. The cache is only saved at a clean
exit, so a bad file stayed.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
This commit is contained in:
Henrik RydgårdandClaude Opus 5.5 committed 2026-10-01 10:26:00 -06:00
1 parent 6b45c4f3e2
commit c5ef99ad3f
1 file changed
+5 -4
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Common/UI/IconCache.cpp
+5 -4
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@@ -79,13 +79,14 @@ bool IconCache::LoadFromFile(FILE *file) {
break;
}
std::string key;
key.resize(entryHeader.keyLen, 0);
if (entryHeader.keyLen > 0x1000) {
// Let's say this is invalid, probably a corrupted file.
if (entryHeader.keyLen > 0x1000 || entryHeader.dataLen > MAX_SAVED_CACHE_SIZE) {
// Let's say this is invalid, probably a corrupted file. Check before allocating.
break;
}
std::string key;
key.resize(entryHeader.keyLen, 0);
if (fread(&key[0], 1, entryHeader.keyLen, file) != entryHeader.keyLen) {
break;
}