From: Yann Collet <yann.collet.73@gmail.com>
Date: Sun, 22 Nov 2015 02:01:33 +0000 (+0100)
Subject: fixed roll buffer greedy mode
X-Git-Tag: zstd-0.4.0^2~23^2~26
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=734aa92ed5404a0de76af0ea8c9393800b14b01b;p=thirdparty%2Fzstd.git

fixed roll buffer greedy mode
---

diff --git a/lib/zstd_compress.c b/lib/zstd_compress.c
index e1a81dae1..a599712bc 100644
--- a/lib/zstd_compress.c
+++ b/lib/zstd_compress.c
@@ -1497,6 +1497,7 @@ size_t ZSTD_compressBlock_lazy_extDict_generic(ZSTD_CCtx* ctx,
             const U32 repIndex = (U32)(current+1 - offset_1);
             const BYTE* const repBase = repIndex < dictLimit ? dictBase : base;
             const BYTE* const repMatch = repBase + repIndex;
+            if ((repIndex <= dictLimit-4) || (repIndex >= dictLimit))
             if (MEM_read32(ip+1) == MEM_read32(repMatch))            
             {
                 /* repcode detected we should take it */