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avcodec/mjpegdec: Fix runtime error: left shift of negative value -511

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Fixes: 693/clusterfuzz-testcase-6109776066904064

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 4b72d5cd6f9341dcafdbc1b9030166aa987b8304)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-03-01 16:32:09 +01:00
parent 250d2b402a
commit 20c36f04b9
1 changed files with 1 additions and 1 deletions
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libavcodec/mjpegdec.c
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@ -1151,7 +1151,7 @@ static int ljpeg_decode_yuv_scan(MJpegDecodeContext *s, int predictor,
if (s->interlaced && s->bottom_field)
ptr16 += linesize >> 1;
pred &= mask;
*ptr16= pred + (dc << point_transform);
*ptr16= pred + ((unsigned)dc << point_transform);
}
if (++x == h) {
x = 0;