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add requested check for legacy decoder v0.1

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which uses a different technique to store literals,
and therefore must check for potential overwrites.
This commit is contained in:
Yann Collet 2023-02-07 14:47:16 -08:00
parent 9419747171
commit c5bf6b8b88
1 changed files with 1 additions and 0 deletions
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lib/legacy/zstd_v01.c
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@ -1735,6 +1735,7 @@ static size_t ZSTD_execSequence(BYTE* op,
if (endMatch > oend) return ERROR(dstSize_tooSmall); /* overwrite beyond dst buffer */ if (endMatch > oend) return ERROR(dstSize_tooSmall); /* overwrite beyond dst buffer */
if (litEnd > litLimit) return ERROR(corruption_detected); /* overRead beyond lit buffer */ if (litEnd > litLimit) return ERROR(corruption_detected); /* overRead beyond lit buffer */
if (sequence.matchLength > (size_t)(*litPtr-op)) return ERROR(dstSize_tooSmall); /* overwrite literal segment */
/* copy Literals */ /* copy Literals */
ZSTD_memmove(op, *litPtr, sequence.litLength); /* note : v0.1 seems to allow scenarios where output or input are close to end of buffer */ ZSTD_memmove(op, *litPtr, sequence.litLength); /* note : v0.1 seems to allow scenarios where output or input are close to end of buffer */