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avcodec/mpeg12dec: Fix runtime error: left shift of negative value -13

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Fixes: 709/clusterfuzz-testcase-4789836449841152

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-03-03 04:39:05 +01:00
parent ab998f4c7f
commit d757ddbaab
1 changed files with 1 additions and 1 deletions
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2
libavcodec/mpeg12dec.c
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@ -497,7 +497,7 @@ static inline int mpeg2_decode_block_intra(MpegEncContext *s,
dc = s->last_dc[component];
dc += diff;
s->last_dc[component] = dc;
block[0] = dc << (3 - s->intra_dc_precision);
block[0] = dc * (1 << (3 - s->intra_dc_precision));
ff_tlog(s->avctx, "dc=%d\n", block[0]);
mismatch = block[0] ^ 1;
i = 0;