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avcodec/mjpegdec: Fix runtime error: left shift of negative value -507

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Fixes: 611/clusterfuzz-testcase-5613455820193792

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 c91bdd4524815125e1f7d8dee22ee7a73173c39a)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-02-19 20:39:13 +01:00
parent 2fd1ab16d9
commit 97bbd8e8d3
1 changed files with 1 additions and 1 deletions
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libavcodec/mjpegdec.c
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@ -1131,7 +1131,7 @@ static int ljpeg_decode_yuv_scan(MJpegDecodeContext *s, int predictor,
if (s->interlaced && s->bottom_field)
ptr += linesize >> 1;
pred &= mask;
*ptr= pred + (dc << point_transform);
*ptr= pred + ((unsigned)dc << point_transform);
}else{
ptr16 = (uint16_t*)(s->picture_ptr->data[c] + 2*(linesize * (v * mb_y + y)) + 2*(h * mb_x + x)); //FIXME optimize this crap
if(y==0 && toprow){