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h264: prevent overreads in intra PCM decoding.
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind CC: libav-stable@libav.org
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@ -1996,6 +1996,8 @@ decode_intra_mb:
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}
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// The pixels are stored in the same order as levels in h->mb array.
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if ((int) (h->cabac.bytestream_end - ptr) < mb_size)
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return -1;
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memcpy(h->mb, ptr, mb_size); ptr+=mb_size;
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ff_init_cabac_decoder(&h->cabac, ptr, h->cabac.bytestream_end - ptr);
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