Merged revisions 168975 via svnmerge from

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

........
r168975 | mmichelson | 2009-01-16 16:42:13 -0600 (Fri, 16 Jan 2009) | 18 lines

Account for possible NULL pointer when we receive a 408 in response to a REGISTER

It may be that by the time we receive a reply to a REGISTER request, the attempt has
timed out and thus the registry structure pointed to by the corresponding sip_pvt has
gone away. This situation was handled properly for a 200 OK response, but the 408
case assumed that the sip_registry struct was non-NULL, thus potentially causing a crash

This commit fixes this assumption and prints out a message to the console if we should
receive a late 408 response to a REGISTER


(closes issue #14211)
Reported by: aborghi
Patches:
      14211.diff uploaded by putnopvut (license 60)
Tested by: aborghi


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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@168976 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -16884,7 +16884,11 @@ static int handle_response_register(struct sip_pvt *p, int resp, char *rest, str
 		break;
 	case 408:	/* Request timeout */
 		/* Got a timeout response, so reset the counter of failed responses */
-		r->regattempts = 0;
+		if (r) {
+			r->regattempts = 0;
+		} else {
+			ast_log(LOG_WARNING, "Got a 408 response to our REGISTER on call %s after we had destroyed the registry object\n", p->callid);
+		}
 		break;
 	case 423:	/* Interval too brief */
 		r->expiry = atoi(get_header(req, "Min-Expires"));