mirror of https://git.ffmpeg.org/ffmpeg.git
avcodec/vc1_block: Fix invalid left shift in vc1_decode_p_mb()
Fixes: left shift of negative value -6 Fixes: 17810/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_VC1_fuzzer-5638541240958976 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Reviewed-by: Paul B Mahol <onemda@gmail.com> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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@ -1481,7 +1481,7 @@ static int vc1_decode_p_mb(VC1Context *v)
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v->vc1dsp.vc1_inv_trans_8x8(v->block[v->cur_blk_idx][block_map[i]]);
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if (v->rangeredfrm)
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for (j = 0; j < 64; j++)
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v->block[v->cur_blk_idx][block_map[i]][j] <<= 1;
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v->block[v->cur_blk_idx][block_map[i]][j] *= 2;
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block_cbp |= 0xF << (i << 2);
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block_intra |= 1 << i;
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} else if (is_coded[i]) {
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