From 6730152baa777fa04d7c494fa4fb53552f65c703 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Fri, 28 May 2021 10:37:00 +0200
Subject: Apply fix for LZ4 CVE-2021-3520 (upstream commit 8301a2177)

---
 libbutl/lz4.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'libbutl')

diff --git a/libbutl/lz4.c b/libbutl/lz4.c
index 9f5e9bf..eac0541 100644
--- a/libbutl/lz4.c
+++ b/libbutl/lz4.c
@@ -1749,7 +1749,7 @@ LZ4_decompress_generic(
                  const size_t dictSize         /* note : = 0 if noDict */
                  )
 {
-    if (src == NULL) { return -1; }
+    if ((src == NULL) || (outputSize < 0)) { return -1; }
 
     {   const BYTE* ip = (const BYTE*) src;
         const BYTE* const iend = ip + srcSize;
-- 
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