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| author | Michael Niedermayer <michael@niedermayer.cc> | 2019-09-10 17:39:45 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2020-07-01 12:49:26 +0200 |
| commit | 7c2a7c1a02bf68330622c260bc8712984d898e6b (patch) | |
| tree | 4d40948299cc6484d2f7b39710318a7c39db28f7 | |
| parent | ba0294877fdf22628796d3d61a3c350ec3a3e252 (diff) | |
| download | ffmpeg-7c2a7c1a02bf68330622c260bc8712984d898e6b.tar.gz | |
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>
(cherry picked from commit c722a69253a280b86b1d2a4ca00c89345a796781)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/vc1_block.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/libavcodec/vc1_block.c b/libavcodec/vc1_block.c index 1f2244e16f..f61bf9a7f0 100644 --- a/libavcodec/vc1_block.c +++ b/libavcodec/vc1_block.c @@ -1978,7 +1978,7 @@ static void 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 |