Merged revisions 328663 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.8

........
  r328663 | markm | 2011-07-18 16:47:04 -0400 (Mon, 18 Jul 2011) | 9 lines
  
  app_dial may double free a channel datastore
  
  When starting a call with originate, and having the callee channel run Bridge() on pickup, we will double free the dialed_interface_info datastore, causing a crash.  Make sure to check if the datastore still exists before trying to free it.
  
  (closes issue ASTERISK-17917)
  Reported by: Mark Murawski
  Tested by: Mark Murawski
........


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.10@328664 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_dial.c

@@ -2409,7 +2409,8 @@ static int dial_exec_full(struct ast_channel *chan, const char *data, struct ast
 	 * datastore again, causing a crash
 	 */
 	ast_channel_lock(chan);
-	if (!ast_channel_datastore_remove(chan, datastore)) {
+	datastore = ast_channel_datastore_find(chan, &dialed_interface_info, NULL); /* make sure we weren't cleaned up already */
+	if (datastore && !ast_channel_datastore_remove(chan, datastore)) {
 		ast_datastore_free(datastore);
 	}
 	ast_channel_unlock(chan);