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avcodec/mjpegdec: Fix integer overflow in ljpeg_decode_rgb_scan()

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Fixes: signed integer overflow: 32768 + 2147450880 cannot be represented in type 'int'
Fixes: 7885/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_THP_fuzzer-5298834394578944

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 936f4a2c2e)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2018-06-05 02:17:24 +02:00
parent ea0734e3f0
commit ce4cb475a3
1 changed files with 1 additions and 1 deletions
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libavcodec/mjpegdec.c
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@ -1002,7 +1002,7 @@ static int ljpeg_decode_rgb_scan(MJpegDecodeContext *s, int nb_components, int p
return -1;
left[i] = buffer[mb_x][i] =
mask & (pred + (dc * (1 << point_transform)));
mask & (pred + (unsigned)(dc * (1 << point_transform)));
}
if (s->restart_interval && !--s->restart_count) {