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avcodec/huffyuvdec: avoid undefined behavior with get_vlc2() failure 

Fixes: left shift of negative value -1
Fixes: 59889/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_HUFFYUV_fuzzer-5472742275940352

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 2023-06-20 00:13:43 +02:00
parent ca09d8a0dc
commit 90647a9249
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1 changed files with 1 additions and 1 deletions
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libavcodec/huffyuvdec.c
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@ -757,7 +757,7 @@ static void decode_plane_bitstream(HYuvDecContext *s, int width, int plane)
}
}
if( width&1 && get_bits_left(&s->gb)>0 ) {
int dst = get_vlc2(&s->gb, s->vlc[plane].table, VLC_BITS, 3)<<2;
int dst = (unsigned)get_vlc2(&s->gb, s->vlc[plane].table, VLC_BITS, 3)<<2;
s->temp16[0][width-1] = dst + get_bits(&s->gb, 2);
}
}