Merged revisions 316328 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.4

........
  r316328 | dvossel | 2011-05-03 16:27:59 -0500 (Tue, 03 May 2011) | 10 lines
  
  Fixes chan_local crashs in local_fixup()
  
  Thanks OEJ for tracking down the issue and submitting the patch.
  
  (closes issue #19053)
  Reported by: oej
  Tested by: oej
  
  Review: https://reviewboard.asterisk.org/r/1158/
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git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.6.2@316329 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_local.c

@@ -526,7 +526,7 @@ static int local_fixup(struct ast_channel *oldchan, struct ast_channel *newchan)
 		p->chan = newchan;
 
 	/* Do not let a masquerade cause a Local channel to be bridged to itself! */
-	if (!ast_check_hangup(newchan) && (p->owner->_bridge == p->chan || p->chan->_bridge == p->owner)) {
+	if (!ast_check_hangup(newchan) && ((p->owner && p->owner->_bridge == p->chan) || (p->chan && p->chan->_bridge == p->owner))) {
 		ast_log(LOG_WARNING, "You can not bridge a Local channel to itself!\n");
 		ao2_unlock(p);
 		ast_queue_hangup(newchan);