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avcodec/vc1_block: Fix invalid shift with rangeredfrm 

Fixes: left shift of negative value -7
Fixes: 16959/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_WMV3_fuzzer-5200360825683968

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 2019-09-10 17:39:45 +02:00
parent 181e138da7
commit c722a69253
1 changed files with 1 additions and 1 deletions
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2
libavcodec/vc1_block.c
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@ -1997,7 +1997,7 @@ static int vc1_decode_b_mb(VC1Context *v)
v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);
if (v->rangeredfrm)
for (j = 0; j < 64; j++)
s->block[i][j] <<= 1;
s->block[i][j] *= 2;
s->idsp.put_signed_pixels_clamped(s->block[i],
s->dest[dst_idx] + off,
i & 4 ? s->uvlinesize