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avcodec/h264_cabac: do not adjust the CABAC mb_type of SI slices

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Undefined shift Replicated through API with UBSAN on i386

Fixes: left shift of 1621233664 by 2 places cannot be represented in type 'int'
Fixes: 538751135/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_H264_fuzzer-5842595151151104
Fixes: 88lh9wyp3VpG

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer authored and michaelni committed 2026-10-12 23:55:55 +00:00
1 parent 6608339778
commit 1a2d690da2
1 file changed
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libavcodec/h264_cabac.c
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@@ -2018,8 +2018,6 @@ int ff_h264_decode_mb_cabac(const H264Context *h, H264SliceContext *sl)
}
} else {
mb_type = decode_cabac_intra_mb_type(sl, 3, 1);
if (sl->slice_type == AV_PICTURE_TYPE_SI && mb_type)
mb_type--;
av_assert2(sl->slice_type_nos == AV_PICTURE_TYPE_I);
decode_intra_mb:
partition_count = 0;