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avcodec/loco: Check left column value

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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@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit c812db814ebd603106220854e343558ec1115e57)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-08-12 21:17:04 +02:00
parent a4ee356189
commit f01618f84b
1 changed files with 2 additions and 0 deletions
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libavcodec/loco.c
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@ -159,6 +159,8 @@ 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++) {