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h264: check context state before decoding slice data partitions
Fixes mov_h264_aac__Demo_FlagOfOurFathers.mov.SIGSEGV.4e9.656. Found-by: Mateusz "j00ru" Jurczyk CC: libav-stable@libav.org
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@ -3848,6 +3848,7 @@ again:
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if (hx->redundant_pic_count == 0 &&
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hx->intra_gb_ptr &&
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hx->s.data_partitioning &&
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s->current_picture_ptr &&
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s->context_initialized &&
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(avctx->skip_frame < AVDISCARD_NONREF || hx->nal_ref_idc) &&
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(avctx->skip_frame < AVDISCARD_BIDIR ||
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