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h264: prevent overreads in intra PCM decoding.

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Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
(cherry picked from commit d1604b3de9)

Signed-off-by: Reinhard Tartler <siretart@tauware.de>
This commit is contained in:
Ronald S. Bultje 2012-02-28 18:48:27 -08:00 committed by Reinhard Tartler
parent 1128b10247
commit cd17195d1c
1 changed files with 2 additions and 0 deletions
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2
libavcodec/h264_cabac.c
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@ -1996,6 +1996,8 @@ decode_intra_mb:
}
// The pixels are stored in the same order as levels in h->mb array.
if ((int) (h->cabac.bytestream_end - ptr) < mb_size)
return -1;
memcpy(h->mb, ptr, mb_size); ptr+=mb_size;
ff_init_cabac_decoder(&h->cabac, ptr, h->cabac.bytestream_end - ptr);