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fix 22294 (#2151)

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This commit is contained in:
Yann Collet
2020-05-18 21:05:10 -07:00
committed by GitHub
parent 9778f46014
commit fdc56baa42
4 changed files with 32 additions and 13 deletions
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lib/compress/zstd_fast.c
+2 -1
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@@ -398,7 +398,7 @@ static size_t ZSTD_compressBlock_fast_extDict_generic(
const BYTE* const ilimit = iend - 8;
U32 offset_1=rep[0], offset_2=rep[1];
DEBUGLOG(5, "ZSTD_compressBlock_fast_extDict_generic");
DEBUGLOG(5, "ZSTD_compressBlock_fast_extDict_generic (offset_1=%u)", offset_1);
/* switch to "regular" variant if extDict is invalidated due to maxDistance */
if (prefixStartIndex == dictStartIndex)
@@ -415,6 +415,7 @@ static size_t ZSTD_compressBlock_fast_extDict_generic(
const BYTE* const repBase = repIndex < prefixStartIndex ? dictBase : base;
const BYTE* const repMatch = repBase + repIndex;
hashTable[h] = current; /* update hash table */
DEBUGLOG(7, "offset_1 = %u , current = %u", offset_1, current);
assert(offset_1 <= current +1); /* check repIndex */
if ( (((U32)((prefixStartIndex-1) - repIndex) >= 3) /* intentional underflow */ & (repIndex > dictStartIndex))