diff options
| author | Michael Niedermayer <michael@niedermayer.cc> | 2019-10-02 19:53:44 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2019-10-03 19:37:28 +0200 |
| commit | 2f588ccfb70cba54a7ea8e740110953da604c0e6 (patch) | |
| tree | 233291da8f2ec7627840d6d7d1e73564a78a9f07 | |
| parent | 9b533de28eb19c660c75823ff2af2f8549c4095a (diff) | |
| download | ffmpeg-2f588ccfb70cba54a7ea8e740110953da604c0e6.tar.gz | |
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>
| -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 fe7dbf8b1d..f1c9f41f30 100644 --- a/libavcodec/vc1_block.c +++ b/libavcodec/vc1_block.c @@ -1481,7 +1481,7 @@ 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 (is_coded[i]) { |