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avcodec/h264: Only reinit quant tables if a new PPS is allowed

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Fixes null pointer dereference
Fixes: signal_sigsegv_3042097_3007_cov_1741463594_non_monotone_timestamps1.mkv

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit c23a0e77dd)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2015-02-24 20:49:07 +01:00
parent db1a99a209
commit 9a63a36dc6
1 changed files with 1 additions and 1 deletions
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2
libavcodec/h264_slice.c
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@ -1515,7 +1515,7 @@ int ff_h264_decode_slice_header(H264Context *h, H264Context *h0)
}
}
if (h == h0 && h->dequant_coeff_pps != pps_id) {
if (first_slice && h->dequant_coeff_pps != pps_id) {
h->dequant_coeff_pps = pps_id;
h264_init_dequant_tables(h);
}