From ec7efe88f5dc9d86049651ce6d367d051fc00f12 Mon Sep 17 00:00:00 2001
From: "W. Felix Handte" <w@felixhandte.com>
Date: Wed, 23 May 2018 16:45:58 -0400
Subject: [PATCH] Fix Off-By-One Error

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

diff --git a/lib/compress/zstd_double_fast.c b/lib/compress/zstd_double_fast.c
index 711bf41a..b862289b 100644
--- a/lib/compress/zstd_double_fast.c
+++ b/lib/compress/zstd_double_fast.c
@@ -169,7 +169,7 @@ size_t ZSTD_compressBlock_doubleFast_generic(
                     U32 const dictMatchIndexL3 = dictHashLong[hl3];
                     const BYTE* dictMatchL3 = dictBase + dictMatchIndexL3;
                     assert(dictMatchL3 < dictEnd);
-                    if (dictMatchL3 > dictLowest && MEM_read64(dictMatchL3) == MEM_read64(ip)) {
+                    if (dictMatchL3 > dictLowest && MEM_read64(dictMatchL3) == MEM_read64(ip+1)) {
                         mLength = ZSTD_count_2segments(ip+1+8, dictMatchL3+8, iend, dictEnd, prefixLowest) + 8;
                         ip++;
                         offset = (U32)(current + 1 - dictMatchIndexL3 - dictIndexDelta);