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avcodec/mpegvideo: Fix null pointer dereference of picture array

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Fixes: 0d0a2bace067d09c08f0fa5340496c23_signal_sigsegv_7ffff713351a_342_WobblyWindowsIntro.avi with memlimit of 67108864

Found-by: Samuel Groß, Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2015-07-14 00:07:53 +02:00
parent 503ec7139f
commit 4bde1a4a37
1 changed files with 1 additions and 1 deletions
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2
libavcodec/mpegvideo.c
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@ -524,7 +524,7 @@ int ff_mpeg_update_thread_context(AVCodecContext *dst,
if(s->picture)
for (i = 0; i < MAX_PICTURE_COUNT; i++) {
ff_mpeg_unref_picture(s->avctx, &s->picture[i]);
if (s1->picture[i].f->buf[0] &&
if (s1->picture && s1->picture[i].f->buf[0] &&
(ret = ff_mpeg_ref_picture(s->avctx, &s->picture[i], &s1->picture[i])) < 0)
return ret;
}