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| author | Michael Niedermayer <michael@niedermayer.cc> | 2019-10-31 15:00:32 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2019-11-21 23:42:51 +0100 |
| commit | 2850004c6d3a38ae64dc1eef178fa45db63ad893 (patch) | |
| tree | ebe310dd869cccb44df97eddbe7c806a47d4d98c /libavcodec/videodsp.c | |
| parent | 61620896a1acd80e00cb8821febe39efd3724978 (diff) | |
| download | ffmpeg-2850004c6d3a38ae64dc1eef178fa45db63ad893.tar.gz | |
avcodec/vc1_block: Fix undefined behavior in ac prediction rescaling
The intermediates are required to fit in 12bit (8.1.3.9 Coefficient Scaling)
See SMPTE 421M-2006 and Amendment 1-2007
Fixes: signed integer overflow: -20691 * 262144 cannot be represented in type 'int'
Fixes: 18479/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_VC1_fuzzer-5128912371187712
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 7fc1baf0ca83ef06014878290339a59735603959)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
Diffstat (limited to 'libavcodec/videodsp.c')
0 files changed, 0 insertions, 0 deletions