From: Yann Collet <yann.collet.73@gmail.com>
Date: Fri, 9 Feb 2024 00:38:20 +0000 (-0800)
Subject: fix fuzz issue 5131069967892480
X-Git-Tag: v1.5.6^2~67^2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b0e8580dc7f71881361f3a6fe46841af9d70bedf;p=thirdparty%2Fzstd.git

fix fuzz issue 5131069967892480
---

diff --git a/lib/compress/zstd_opt.c b/lib/compress/zstd_opt.c
index 0449204dd..c2ec2a9ed 100644
--- a/lib/compress/zstd_opt.c
+++ b/lib/compress/zstd_opt.c
@@ -1216,6 +1216,7 @@ ZSTD_compressBlock_opt_generic(ZSTD_matchState_t* ms,
                     if ( (optLevel >= 1) /* additional check only for higher modes */
                       && (prevMatch.litlen == 0) /* replace a match */
                       && (LL_INCPRICE(1) < 0) /* ll1 is cheaper than ll0 */
+                      && LIKELY(ip + cur < iend)
                     ) {
                         /* check next position, in case it would be cheaper */
                         int with1literal = prevMatch.price + LIT_PRICE(ip+cur) + LL_INCPRICE(1);