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avcodec/vc1_block: fix invalid shift in vc1_decode_p_mb() 

Fixes: left shift of negative value -5
Fixes: 15294/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_VC1_fuzzer-5733921754447872

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-06-22 12:35:24 +02:00
parent da93e2b142
commit b153ba1c2e
1 changed files with 1 additions and 1 deletions
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2
libavcodec/vc1_block.c
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@ -1378,7 +1378,7 @@ static int vc1_decode_p_mb(VC1Context *v)
v->vc1dsp.vc1_inv_trans_8x8(v->block[v->cur_blk_idx][block_map[i]]);
if (v->rangeredfrm)
for (j = 0; j < 64; j++)
v->block[v->cur_blk_idx][block_map[i]][j] <<= 1;
v->block[v->cur_blk_idx][block_map[i]][j] *= 2;
block_cbp |= 0xF << (i << 2);
block_intra |= 1 << i;
} else if (val) {