From 881abe44f17d6fc8ef8805e221e4ae48f4a7d5f0 Mon Sep 17 00:00:00 2001
From: Sean Purcell <me@seanp.xyz>
Date: Tue, 7 Mar 2017 16:52:23 -0800
Subject: [PATCH] Reduce point at which we reduce offsets to protect against UB

---
 lib/compress/zstd_compress.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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);
-- 
2.47.2