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avcodec/mpeg12dec: Fix invalid shift in mpeg2_fast_decode_block_intra()

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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>
(cherry picked from commit c40df2166c7925fc81e1ef22563c2e32124cf1d6)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-12-05 22:35:03 +01:00
parent 781636afa0
commit 2df0d6520c
1 changed files with 1 additions and 1 deletions
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2
libavcodec/mpeg12dec.c
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@ -654,7 +654,7 @@ 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;