commit d82dde28d7e9b1c2e39e62aac433099779da3f04
Author: Simon McVittie <simon.mcvittie@collabora.co.uk>
Date:   2009-06-12 16:42:34 +0100

    fd.o #22182: fix a potential use-after-free in the callable example CM
    
    In some environments (I'm not sure why my laptop isn't among them),
    closing the stream causes the channel to remove the last ref to the
    stream, resulting in a use-after-free and a possible segfault.
    
    This could be avoided by holding another ref for the duration of
    example_callable_media_stream_close, but Sjoerd and I agreed that this
    simpler fix (re-ordering to put the possible free last) was more
    appropriate.

diff --git a/examples/cm/callable/media-stream.c b/examples/cm/callable/media-stream.c
index 1177064..3290029 100644
--- a/examples/cm/callable/media-stream.c
+++ b/examples/cm/callable/media-stream.c
@@ -389,12 +389,14 @@ example_callable_media_stream_close (ExampleCallableMediaStream *self)
       g_message ("Sending to server: Closing stream %u",
           self->priv->id);
 
-      g_signal_emit (self, signals[SIGNAL_REMOVED], 0);
-
       if (self->priv->connected_event_id != 0)
         {
           g_source_remove (self->priv->connected_event_id);
         }
+
+      /* this has to come last, because the MediaChannel may unref us in
+       * response to the removed signal */
+      g_signal_emit (self, signals[SIGNAL_REMOVED], 0);
     }
 }