[FFmpeg-cvslog] avcodec/vc1dec: do not crash when flushing without an allocated frame

[Michael Niedermayer]

ffmpeg | branch: release/2.3 | Michael Niedermayer <michaelni at gmx.at> | Mon Aug 11 02:16:43 2014 +0200| [a1fe3b41507300dbaa9a082eb43155f07fcf5124] | committer: Michael Niedermayer

avcodec/vc1dec: do not crash when flushing without an allocated frame

Fixes Ticket3837
Found-by: Piotr Bandurski <ami_stuff at o2.pl>
Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
(cherry picked from commit 6801eb0a0981f113f5f09ed4799d9ae805af62a3)

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=a1fe3b41507300dbaa9a082eb43155f07fcf5124
---

 libavcodec/vc1dec.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/vc1dec.c b/libavcodec/vc1dec.c
index 06deb7f..a73d615 100644
--- a/libavcodec/vc1dec.c
+++ b/libavcodec/vc1dec.c
@@ -5514,7 +5514,7 @@ static void vc1_sprite_flush(AVCodecContext *avctx)
        Since we can't enforce it, clear to black the missing sprite. This is
        wrong but it looks better than doing nothing. */
 
-    if (f->data[0])
+    if (f && f->data[0])
         for (plane = 0; plane < (s->flags&CODEC_FLAG_GRAY ? 1 : 3); plane++)
             for (i = 0; i < v->sprite_height>>!!plane; i++)
                 memset(f->data[plane] + i * f->linesize[plane],