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h264: do not call field_end if we do not have a current picture

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Fixes invalid reads.

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC:libav-stable@libav.org
This commit is contained in:
Anton Khirnov 2013-11-28 10:54:35 +01:00
parent 7f0e81db3c
commit 00dbff4c3e
1 changed files with 1 additions and 1 deletions
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2
libavcodec/h264.c
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@ -3348,7 +3348,7 @@ static int decode_slice_header(H264Context *h, H264Context *h0)
first_mb_in_slice = get_ue_golomb(&h->gb);
if (first_mb_in_slice == 0) { // FIXME better field boundary detection
if (h0->current_slice && FIELD_PICTURE(h)) {
if (h0->current_slice && h->cur_pic_ptr && FIELD_PICTURE(h)) {
field_end(h, 1);
}