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| author | Michael Niedermayer <michael@niedermayer.cc> | 2019-10-02 19:53:44 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2019-12-31 19:51:56 +0100 |
| commit | 44b48d6acbbdce6e6bbd7c8189ae457094a005b3 (patch) | |
| tree | cee4306838599ca6723bf14963be9567207fa268 | |
| parent | 9cb50bb3cc6db690d5ff47a51ab9b9ff3f24630e (diff) | |
| download | ffmpeg-44b48d6acbbdce6e6bbd7c8189ae457094a005b3.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>
(cherry picked from commit 2f588ccfb70cba54a7ea8e740110953da604c0e6)
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]) { |