[FFmpeg-cvslog] avcodec/loco: Fix integer overflow with large values from loco_get_rice()

[Michael Niedermayer]

ffmpeg | branch: release/4.2 | Michael Niedermayer <michael at niedermayer.cc> | Tue Jun 30 21:11:25 2020 +0200| [b8f3879bcca06f6277a9462d385868643f22379f] | committer: Michael Niedermayer

avcodec/loco: Fix integer overflow with large values from loco_get_rice()

Fixes: signed integer overflow: 155 + 2147483647 cannot be represented in type 'int'
Fixes: 23421/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_LOCO_fuzzer-5652849097965568

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 3ddc5e1f3cebca25ade54ee68159d305f210bf5f)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=b8f3879bcca06f6277a9462d385868643f22379f
---

 libavcodec/loco.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/loco.c b/libavcodec/loco.c
index d0cedf577d..25dd1575ba 100644
--- a/libavcodec/loco.c
+++ b/libavcodec/loco.c
@@ -131,7 +131,7 @@ static int loco_decode_plane(LOCOContext *l, uint8_t *data, int width, int heigh
                              int stride, const uint8_t *buf, int buf_size)
 {
     RICEContext rc;
-    int val;
+    unsigned val;
     int ret;
     int i, j;