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Bug fix redzones by unpoisoning only the intended buffer and not the followup redzone.

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This commit is contained in:
Yonatan Komornik 2023-01-24 12:54:43 -08:00
parent 41682e6293
commit 1d636b4ba0
1 changed files with 3 additions and 1 deletions
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4
lib/compress/zstd_cwksp.h
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@ -348,7 +348,9 @@ ZSTD_cwksp_reserve_internal(ZSTD_cwksp* ws, size_t bytes, ZSTD_cwksp_alloc_phase
if (alloc) {
alloc = (BYTE *)alloc + ZSTD_CWKSP_ASAN_REDZONE_SIZE;
if (ws->isStatic == ZSTD_cwksp_dynamic_alloc) {
__asan_unpoison_memory_region(alloc, bytes);
/* We need to keep the redzone poisoned while unpoisoning the bytes that
* are actually allocated. */
__asan_unpoison_memory_region(alloc, bytes - 2 * ZSTD_CWKSP_ASAN_REDZONE_SIZE);
}
}
#endif