Merged revisions 319144 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.6.2

........
  r319144 | dvossel | 2011-05-16 10:56:16 -0500 (Mon, 16 May 2011) | 2 lines
  
  Fixes issue with peer ref-counting during handle_request_subscribe.

  (closes issue #19293)
  Reported by: irroot
........


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.8@319145 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -23707,7 +23707,7 @@ static int handle_request_subscribe(struct sip_pvt *p, struct sip_request *req,
 		const char *unknown_acceptheader = NULL;
 
 		if (authpeer)	/* We do not need the authpeer any more */
-			unref_peer(authpeer, "unref_peer, from handle_request_subscribe (authpeer 2)");
+			authpeer = unref_peer(authpeer, "unref_peer, from handle_request_subscribe (authpeer 2)");
 
 		/* Header from Xten Eye-beam Accept: multipart/related, application/rlmi+xml, application/pidf+xml, application/xpidf+xml */
 		accept = __get_header(req, "Accept", &start);
@@ -23838,9 +23838,10 @@ static int handle_request_subscribe(struct sip_pvt *p, struct sip_request *req,
 		return 0;
 	}
 
-	/* At this point, if we have an authpeer (which we have to have to get here) we should unref
-	 * it since if we have actually used it, we have reffed it when p->relatedpeer was set. */
-	authpeer = unref_peer(authpeer, "unref pointer into (*authpeer)");
+	/* At this point, if we have an authpeer we should unref it. */
+	if (authpeer) {
+		authpeer = unref_peer(authpeer, "unref pointer into (*authpeer)");
+	}
 
 	/* Add subscription for extension state from the PBX core */
 	if (p->subscribed != MWI_NOTIFICATION  && p->subscribed != CALL_COMPLETION && !resubscribe) {