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h264: reset data partitioning at the beginning of each decode call 

Prevents using GetBitContexts with data from previous calls.

Fixes access to freed memory.

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 e46ad30a80
commit 1f097d168d
1 changed files with 10 additions and 1 deletions
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11
libavcodec/h264.c
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@ -1764,7 +1764,6 @@ static int decode_update_thread_context(AVCodecContext *dst,
h->picture_structure = h1->picture_structure;
h->qscale = h1->qscale;
h->droppable = h1->droppable;
h->data_partitioning = h1->data_partitioning;
h->low_delay = h1->low_delay;
for (i = 0; i < MAX_PICTURE_COUNT; i++) {
@ -4745,6 +4744,13 @@ again:
}
break;
case NAL_DPA:
if (h->avctx->flags & CODEC_FLAG2_CHUNKS) {
av_log(h->avctx, AV_LOG_ERROR,
"Decoding in chunks is not supported for "
"partitioned slices.\n");
return AVERROR(ENOSYS);
}
init_get_bits(&hx->gb, ptr, bit_length);
hx->intra_gb_ptr =
hx->inter_gb_ptr = NULL;
@ -4894,6 +4900,9 @@ static int h264_decode_frame(AVCodecContext *avctx, void *data,
int ret;
h->flags = avctx->flags;
/* reset data partitioning here, to ensure GetBitContexts from previous
* packets do not get used. */
h->data_partitioning = 0;
/* end of stream, output what is still in the buffers */
out: