mirror of https://git.ffmpeg.org/ffmpeg.git
avcodec/mpeg12dec: Fix runtime error: left shift of negative value -1
Fixes: 764/clusterfuzz-testcase-6273034652483584 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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@ -994,7 +994,7 @@ static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
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cbp = get_vlc2(&s->gb, ff_mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
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cbp = get_vlc2(&s->gb, ff_mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
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if (mb_block_count > 6) {
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if (mb_block_count > 6) {
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cbp <<= mb_block_count - 6;
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cbp *= 1 << mb_block_count - 6;
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cbp |= get_bits(&s->gb, mb_block_count - 6);
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cbp |= get_bits(&s->gb, mb_block_count - 6);
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s->bdsp.clear_blocks(s->block[6]);
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s->bdsp.clear_blocks(s->block[6]);
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}
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}
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