[FFmpeg-cvslog] avcodec/loco: Check left column value

[Michael Niedermayer]

ffmpeg | branch: release/4.2 | Michael Niedermayer <michael at niedermayer.cc> | Mon Aug 12 21:17:04 2019 +0200| [3349be5745c330867c98dfd3810c0cf04f723c40] | committer: Michael Niedermayer

avcodec/loco: Check left column value

Fixes: Timeout (42sec -> 379 ms)
Fixes: 16323/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_LOCO_fuzzer-5679178099195904

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Paul B Mahol <onemda at gmail.com>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit c812db814ebd603106220854e343558ec1115e57)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=3349be5745c330867c98dfd3810c0cf04f723c40
---

 libavcodec/loco.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavcodec/loco.c b/libavcodec/loco.c
index 5fb414b411..d8bf68a100 100644
--- a/libavcodec/loco.c
+++ b/libavcodec/loco.c
@@ -161,6 +161,8 @@ static int loco_decode_plane(LOCOContext *l, uint8_t *data, int width, int heigh
     for (j = 1; j < height; j++) {
         /* restore left column */
         val = loco_get_rice(&rc);
+        if (val == INT_MIN)
+           return AVERROR_INVALIDDATA;
         data[0] = data[-stride] + val;
         /* restore all other pixels */
         for (i = 1; i < width; i++) {