From 63fc6fbf7ee9e6a587598af085f22742cd9e6798 Mon Sep 17 00:00:00 2001
From: Yann Collet <cyan@fb.com>
Date: Mon, 10 Sep 2018 16:22:16 -0700
Subject: restored nullifying output

to counter possible (offset==0)
---
 lib/lz4.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/lib/lz4.c b/lib/lz4.c
index c68a7da..0545bbc 100644
--- a/lib/lz4.c
+++ b/lib/lz4.c
@@ -1536,7 +1536,11 @@ LZ4_decompress_generic(
 
 _copy_match:
         if ((checkOffset) && (unlikely(match + dictSize < lowPrefix))) goto _output_error;   /* Error : offset outside buffers */
-        // LZ4_write32(op, (U32)offset);   /* costs ~1%; silence an msan warning when offset==0 */   /* note : no longer valid with partialDecoding, since there is no guarantee that at least 4 bytes are available */
+        if (!partialDecoding) {
+            assert(oend > op);
+            assert(oend - op >= 4);
+            LZ4_write32(op, 0);   /* silence an msan warning when offset==0; costs <1%; */
+        }   /* note : when partialDecoding, there is no guarantee that at least 4 bytes remain available in output buffer */
 
         if (length == ML_MASK) {
             unsigned s;
-- 
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