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pngdec: check s->last_picture.f->data[0] before using it 

This check was removed in commit 08aec6f6, but
s->last_picture.f->data[0] is still used in handle_p_frame_apng
unconditionally.

This fixes a segmentation fault.

Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 287dbb0771)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Andreas Cadhalpun 2015-05-03 16:21:39 +02:00 committed by Michael Niedermayer
parent 4d6d159069
commit c3653e2265
1 changed files with 1 additions and 1 deletions
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2
libavcodec/pngdec.c
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@ -1065,7 +1065,7 @@ exit_loop:
/* handle p-frames only if a predecessor frame is available */
ref = s->dispose_op == APNG_DISPOSE_OP_PREVIOUS ?
s->previous_picture.f : s->last_picture.f;
if (ref->data[0]) {
if (ref->data[0] && s->last_picture.f->data[0]) {
if ( !(avpkt->flags & AV_PKT_FLAG_KEY) && avctx->codec_tag != AV_RL32("MPNG")
&& ref->width == p->width
&& ref->height== p->height