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Merge pull request #593 from iburinoc/undef

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Reduce point at which we reduce offsets to protect against UB
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Yann Collet 2017-03-07 18:31:38 -08:00 committed by GitHub
commit 15c9dd80a8
1 changed files with 1 additions and 1 deletions
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lib/compress/zstd_compress.c
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@ -2347,7 +2347,7 @@ static size_t ZSTD_compress_generic (ZSTD_CCtx* cctx,
if (remaining < blockSize) blockSize = remaining; if (remaining < blockSize) blockSize = remaining;
/* preemptive overflow correction */ /* preemptive overflow correction */
if (cctx->lowLimit > (2U<<30)) { if (cctx->lowLimit > (3U<<29)) {
U32 const cycleMask = (1 << ZSTD_cycleLog(cctx->params.cParams.hashLog, cctx->params.cParams.strategy)) - 1; U32 const cycleMask = (1 << ZSTD_cycleLog(cctx->params.cParams.hashLog, cctx->params.cParams.strategy)) - 1;
U32 const current = (U32)(ip - cctx->base); U32 const current = (U32)(ip - cctx->base);
U32 const newCurrent = (current & cycleMask) + (1 << cctx->params.cParams.windowLog); U32 const newCurrent = (current & cycleMask) + (1 << cctx->params.cParams.windowLog);