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avcodec/vp3: check current_frame before accessing it 

Fixes null pointer dereference
Fixes: b15eb06e0111e94bc59123c86db7aff9_signal_sigsegv_a0500f_45_320vp3.nsv with allocation limit  536870912

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 2015-07-13 19:10:59 +02:00
parent ba05166174
commit 697160366f
1 changed files with 2 additions and 0 deletions
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2
libavcodec/vp3.c
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@ -1947,6 +1947,8 @@ static int vp3_update_thread_context(AVCodecContext *dst, const AVCodecContext *
}
if (s != s1) {
if (!s->current_frame.f)
return AVERROR(ENOMEM);
// init tables if the first frame hasn't been decoded
if (!s->current_frame.f->data[0]) {
int y_fragment_count, c_fragment_count;