From 69b8d83ecf5f6deb9ad94bdaa816aa205430d3e9 Mon Sep 17 00:00:00 2001
From: Stefano Sabatini <stefano.sabatini-lala@poste.it>
Date: Sun, 19 Dec 2010 13:02:05 +0000
Subject: [PATCH] Fix crash in gradfun:end_frame() when inpic == outpic, so it
 has to be freed just once.

Originally committed as revision 26058 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavfilter/vf_gradfun.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libavfilter/vf_gradfun.c b/libavfilter/vf_gradfun.c
index 1cbf8d8c2a..3a400a04eb 100644
--- a/libavfilter/vf_gradfun.c
+++ b/libavfilter/vf_gradfun.c
@@ -228,7 +228,8 @@ static void end_frame(AVFilterLink *inlink)
     avfilter_draw_slice(outlink, 0, inlink->h, 1);
     avfilter_end_frame(outlink);
     avfilter_unref_buffer(inpic);
-    avfilter_unref_buffer(outpic);
+    if (outpic != inpic)
+        avfilter_unref_buffer(outpic);
 }
 
 AVFilter avfilter_vf_gradfun = {