From: Sean Purcell <me@seanp.xyz>
Date: Wed, 8 Mar 2017 00:52:23 +0000 (-0800)
Subject: Reduce point at which we reduce offsets to protect against UB
X-Git-Tag: v1.1.4~1^2~8^2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F593%2Fhead;p=thirdparty%2Fzstd.git

Reduce point at which we reduce offsets to protect against UB
---

diff --git a/lib/compress/zstd_compress.c b/lib/compress/zstd_compress.c
index 308659467..15a9245e4 100644
--- a/lib/compress/zstd_compress.c
+++ b/lib/compress/zstd_compress.c
@@ -2347,7 +2347,7 @@ static size_t ZSTD_compress_generic (ZSTD_CCtx* cctx,
         if (remaining < blockSize) blockSize = remaining;
 
         /* 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 current = (U32)(ip - cctx->base);
             U32 const newCurrent = (current & cycleMask) + (1 << cctx->params.cParams.windowLog);