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| author | Michael Niedermayer <michael@niedermayer.cc> | 2019-12-05 22:35:03 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2020-03-11 23:51:36 +0100 |
| commit | c40df2166c7925fc81e1ef22563c2e32124cf1d6 (patch) | |
| tree | 14a1122f54143c0eb60bb24f52b14424ae120f9d | |
| parent | 5f8c38345247be4baa6d6f0b4ef5f5ce94c1ba7d (diff) | |
| download | ffmpeg-c40df2166c7925fc81e1ef22563c2e32124cf1d6.tar.gz | |
avcodec/mpeg12dec: Fix invalid shift in mpeg2_fast_decode_block_intra()
Fixes: left shift of negative value -695
Fixes: 19232/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MPEG1VIDEO_fuzzer-5702856963522560
Fixes: 19555/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MPEG1VIDEO_fuzzer-5741218147598336
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/mpeg12dec.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/libavcodec/mpeg12dec.c b/libavcodec/mpeg12dec.c index 17f9495a1d..3927200e74 100644 --- a/libavcodec/mpeg12dec.c +++ b/libavcodec/mpeg12dec.c @@ -586,7 +586,7 @@ static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s, dc = s->last_dc[component]; dc += diff; s->last_dc[component] = dc; - block[0] = dc << (3 - s->intra_dc_precision); + block[0] = dc * (1 << (3 - s->intra_dc_precision)); i = 0; if (s->intra_vlc_format) rl = &ff_rl_mpeg2; |