res/res_pjsip_session: Check for presence of an active negotiator

It is possible in a hypothetical situation for a session refresh to be
invoked on a PJSIP when the negotiatior on the INVITE session has not
yet been established. While this shouldn't occur with existing uses of
ast_sip_session_refresh, the crashes that occur due to improperly
calling PJSIP functions that expect a non-NULL negotiatior are
avoidable. PJSIP will create the negotiator in pjsip_inv_reinvite; this
means that simply checking for the presence of the negotiator before
passing it to other PJSIP functions that use it is allowable. As such,
this patch adds checks for the presence of the negotiator before calling
PJSIP functions that assume it is non-NULL.

Change-Id: I1028323e7e01b0a531865e5412a71b6f6ec4276d

res/res_pjsip_session.c

@@ -792,12 +792,14 @@ static int delay_request(struct ast_sip_session *session,
 static pjmedia_sdp_session *generate_session_refresh_sdp(struct ast_sip_session *session)
 {
 	pjsip_inv_session *inv_session = session->inv_session;
-	const pjmedia_sdp_session *previous_sdp;
+	const pjmedia_sdp_session *previous_sdp = NULL;
 
-	if (pjmedia_sdp_neg_was_answer_remote(inv_session->neg)) {
-		pjmedia_sdp_neg_get_active_remote(inv_session->neg, &previous_sdp);
-	} else {
-		pjmedia_sdp_neg_get_active_local(inv_session->neg, &previous_sdp);
+	if (inv_session->neg) {
+		if (pjmedia_sdp_neg_was_answer_remote(inv_session->neg)) {
+			pjmedia_sdp_neg_get_active_remote(inv_session->neg, &previous_sdp);
+		} else {
+			pjmedia_sdp_neg_get_active_local(inv_session->neg, &previous_sdp);
+		}
 	}
 	return create_local_sdp(inv_session, session, previous_sdp);
 }
@@ -917,7 +919,9 @@ int ast_sip_session_refresh(struct ast_sip_session *session,
 
 	if (generate_new_sdp) {
 		/* SDP can only be generated if current negotiation has already completed */
-		if (pjmedia_sdp_neg_get_state(inv_session->neg) != PJMEDIA_SDP_NEG_STATE_DONE) {
+		if (inv_session->neg
+			&& pjmedia_sdp_neg_get_state(inv_session->neg)
+				!= PJMEDIA_SDP_NEG_STATE_DONE) {
 			ast_debug(3, "Delay session refresh with new SDP to %s because SDP negotiation is not yet done...\n",
 				ast_sorcery_object_get_id(session->endpoint));
 			return delay_request(session, on_request_creation, on_sdp_creation,