[FFmpeg-cvslog] avutil/frame: fix crash with av_frame_unref(NULL)

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Mon Jul 13 19:25:03 2015 +0200| [feb6a94f740bccc8e369f8b74714b940490f3901] | committer: Michael Niedermayer

avutil/frame: fix crash with av_frame_unref(NULL)

Fixes: af94b3a3d26586c08f557cafe8246251_signal_sigsegv_7ffff713351a_343_XFMode.ASF with 2097152 alloc limit

Found-by: Samuel Groß, Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=feb6a94f740bccc8e369f8b74714b940490f3901
---

 libavutil/frame.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/libavutil/frame.c b/libavutil/frame.c
index 4596927..4ae75ef 100644
--- a/libavutil/frame.c
+++ b/libavutil/frame.c
@@ -463,6 +463,9 @@ void av_frame_unref(AVFrame *frame)
 {
     int i;
 
+    if (!frame)
+        return;
+
     wipe_side_data(frame);
 
     for (i = 0; i < FF_ARRAY_ELEMS(frame->buf); i++)