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h264: reset data_partitioning if decoding the slice header for NAL_DPA fails

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If it was set before then we can end up trying to decode a slice without
a valid slice header, which can lead to invalid memory access.

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC:libav-stable@libav.org
This commit is contained in:
Anton Khirnov 2013-11-28 10:54:35 +01:00
parent e89aa4bf56
commit 58312b2472
1 changed files with 6 additions and 1 deletions
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7
libavcodec/h264.c
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@ -4725,8 +4725,13 @@ again:
hx->intra_gb_ptr =
hx->inter_gb_ptr = NULL;
if ((err = decode_slice_header(hx, h)) < 0)
if ((err = decode_slice_header(hx, h)) < 0) {
/* make sure data_partitioning is cleared if it was set
* before, so we don't try decoding a slice without a valid
* slice header later */
h->data_partitioning = 0;
break;
}
hx->data_partitioning = 1;
break;