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h264: error out on unset current_picture_ptr for h->current_slice > 0
Fixes a segfault with fuzzed sample sample_varPAR_s11622_r001-02.avi. CC: libav-stable@libav.org
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@ -2624,6 +2624,11 @@ static int decode_slice_header(H264Context *h, H264Context *h0)
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s->picture_structure = last_pic_structure;
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s->dropable = last_pic_dropable;
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return AVERROR_INVALIDDATA;
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} else if (!s->current_picture_ptr) {
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av_log(s->avctx, AV_LOG_ERROR,
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"unset current_picture_ptr on %d. slice\n",
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h0->current_slice + 1);
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return AVERROR_INVALIDDATA;
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}
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} else {
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/* Shorten frame num gaps so we don't have to allocate reference
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