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h264: error out on unset current_picture_ptr for h->current_slice > 0

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Fixes a segfault with fuzzed sample sample_varPAR_s11622_r001-02.avi.

CC: libav-stable@libav.org
(cherry picked from commit 0b300daad2)

Signed-off-by: Reinhard Tartler <siretart@tauware.de>
This commit is contained in:
Janne Grunau
2012-11-21 19:41:59 +01:00
committed by Reinhard Tartler
parent b6592b402c
commit f1b3cc02ec
1 changed files with 5 additions and 0 deletions
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libavcodec/h264.c
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@@ -2889,6 +2889,11 @@ static int decode_slice_header(H264Context *h, H264Context *h0){
s->picture_structure = last_pic_structure;
s->dropable = last_pic_dropable;
return AVERROR_INVALIDDATA;
} else if (!s->current_picture_ptr) {
av_log(s->avctx, AV_LOG_ERROR,
"unset current_picture_ptr on %d. slice\n",
h0->current_slice + 1);
return AVERROR_INVALIDDATA;
}
} else {
/* Shorten frame num gaps so we don't have to allocate reference