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avformat/matroskadec: Fix undefined shift in read_sint()

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Fixes: asan_heap-oob_17212bc_2243_cov_594210248_h264_TTA.mkv

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2015-07-01 11:59:57 +02:00
parent 8750aef3d6
commit 2f8c81637c
1 changed files with 1 additions and 1 deletions
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libavformat/matroskadec.c
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@ -806,7 +806,7 @@ static int ebml_read_sint(AVIOContext *pb, int size, int64_t *num)
/* big-endian ordering; build up number */
while (n++ < size)
*num = (*num << 8) | avio_r8(pb);
*num = ((uint64_t)*num << 8) | avio_r8(pb);
}
return 0;