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avcodec/h264_slice: Check PPS more extensively when its not copied

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Fixes Ticket5371
Fixes null pointer dereference

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit c50be7a52b)

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2016-03-25 15:29:26 +01:00
parent a35e6ec1bd
commit ef54c14425
1 changed files with 7 additions and 3 deletions
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10
libavcodec/h264_slice.c
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@ -1282,9 +1282,13 @@ int ff_h264_decode_slice_header(H264Context *h, H264SliceContext *sl)
if (first_slice) {
h->pps = *h->pps_buffers[pps_id];
} else if (h->setup_finished && h->dequant_coeff_pps != pps_id) {
av_log(h->avctx, AV_LOG_ERROR, "PPS changed between slices\n");
return AVERROR_INVALIDDATA;
} else {
if (h->pps.sps_id != pps->sps_id ||
h->pps.transform_8x8_mode != pps->transform_8x8_mode ||
(h->setup_finished && h->dequant_coeff_pps != pps_id)) {
av_log(h->avctx, AV_LOG_ERROR, "PPS changed between slices\n");
return AVERROR_INVALIDDATA;
}
}
if (pps->sps_id != h->sps.sps_id ||