!6 fix CVE-2021-3520

From: @tong_1001
Reviewed-by: @overweight
Signed-off-by: @overweight

backport-CVE-2021-3520.patch

@@ -0,0 +1,22 @@
+From 8301a21773ef61656225e264f4f06ae14462bca7 Mon Sep 17 00:00:00 2001
+From: Jasper Lievisse Adriaanse <j@jasper.la>
+Date: Fri, 26 Feb 2021 15:21:20 +0100
+Subject: [PATCH] Fix potential memory corruption with negative memmove() size
+
+---
+ lib/lz4.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/lib/lz4.c b/lib/lz4.c
+index 5f524d01d..c2f504ef3 100644
+--- a/lib/lz4.c
++++ b/lib/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;

lz4.spec

@@ -1,12 +1,13 @@
 Name:           lz4
 Version:        1.9.3
-Release:        1
+Release:        2
 Summary:        Extremely fast compression algorithm
 
 License:        GPLv2+ and BSD
 URL:            https://lz4.github.io/lz4/
 Source0:        https://github.com/lz4/lz4/archive/v%{version}/%{name}-%{version}.tar.gz
-Patch6000:		Fix-Data-Corruption-Bug-when-Streaming-with-an-Attac.patch
+Patch6000:      Fix-Data-Corruption-Bug-when-Streaming-with-an-Attac.patch
+Patch6001:      backport-CVE-2021-3520.patch
 
 Provides:       %{name}-libs = %{version}-%{release}
 Obsoletes:      %{name} < 1.7.5-3
@@ -68,6 +69,9 @@ export MOREFLAGS="-g"
 %{_mandir}/man1/unlz4.1*
 
 %changelog
+* Sat Jun 19 2021 shixuantong <shixuantong@huawei.com> - 1.9.3-2 
+- fix CVE-2021-3520
+
 * Thu Jan 28 2021 liudabo <liudabo1@huawei.com> - 1.9.3-1
 - upgrade version to 1.9.3