Check for error so that

avfilter_open(av_filter_get_by_name(...etc...)) fails 
gracefully.

Commited in SoC by Vitor Sessak on 2007-10-29 16:00:27


git-svn-id: file:///var/local/repositories/ffmpeg/trunk@12024 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavfilter/avfilter.c

@@ -363,7 +363,12 @@ static const char *filter_name(void *p)
 
 AVFilterContext *avfilter_open(AVFilter *filter, char *inst_name)
 {
-    AVFilterContext *ret = av_malloc(sizeof(AVFilterContext));
+    AVFilterContext *ret;
+
+    if (!filter)
+        return 0;
+
+    ret = av_malloc(sizeof(AVFilterContext));
 
     ret->av_class = av_mallocz(sizeof(AVClass));
     ret->av_class->item_name = filter_name;