segfault fix

Originally committed as revision 4430 to svn://svn.ffmpeg.org/ffmpeg/trunk

diff --git a/libavcodec/imgconvert.c b/libavcodec/imgconvert.c
index 1ba723a..afb66fa 100644 (file)
--- a/libavcodec/imgconvert.c
+++ b/libavcodec/imgconvert.c
@@ -576,6 +576,8 @@ static void img_copy_plane(uint8_t *dst, int dst_wrap,
                            const uint8_t *src, int src_wrap,
                            int width, int height)
 {
+    if((!dst) || (!src)) 
+        return;
     for(;height > 0; height--) {
         memcpy(dst, src, width);
         dst += dst_wrap;