[FFmpeg-devel] Fix leak when user preallocates a AVFormatContext, passes it to av_open_input_file, but file does not exist on disk

[Art Clarke]

av_open_input_file takes memory ownership of *ic_ptr, and therefore must
free it if it nulls it.  If you pass in your own AVFormatContext (i.e. you
pass in AVFormatParameters with prealloced_context>0), but then the file
doesn't exist on disk, the current code nulls the AVFormatContext pointer
without freeing it (while if av_open_input_stream fails, it will free it
before nulling it).

This patch makes the behavior consistent and patches a leak as a result.

- Art

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Index: libavformat/utils.c
===================================================================
--- libavformat/utils.c	(revision 19327)
+++ libavformat/utils.c	(working copy)
@@ -499,6 +499,7 @@
     av_freep(&pd->buf);
     if (pb)
         url_fclose(pb);
+    av_free(*ic_ptr);
     *ic_ptr = NULL;
     return err;