chan_sip: Fix crash in ast_channel_hangupcause_set().

* Fix crash in ast_channel_hangupcause_set() because p->owner not checked
before calling.  Regression introduced by the fix for ASTERISK-22621.

(closes issue ASTERISK-23135)
Reported by: OK

(issue ASTERISK-23323)
Reported by: Walter Doekes
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Merged revisions 409156 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 409157 from http://svn.asterisk.org/svn/asterisk/branches/11
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Merged revisions 409158 from http://svn.asterisk.org/svn/asterisk/branches/12

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@409159 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index f717c77..1b4fa4a 100644 (file)
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -23114,9 +23114,11 @@ static void handle_response_invite(struct sip_pvt *p, int resp, const char *rest
                                        /* This 200 OK's SDP is not acceptable, so we need to ack, then hangup */
                                        /* For re-invites, we try to recover */
                                        ast_set_flag(&p->flags[0], SIP_PENDINGBYE);
-                                       ast_channel_hangupcause_set(p->owner, AST_CAUSE_BEARERCAPABILITY_NOTAVAIL);
                                        p->hangupcause = AST_CAUSE_BEARERCAPABILITY_NOTAVAIL;
-                                       sip_queue_hangup_cause(p, AST_CAUSE_BEARERCAPABILITY_NOTAVAIL);
+                                       if (p->owner) {
+                                               ast_channel_hangupcause_set(p->owner, AST_CAUSE_BEARERCAPABILITY_NOTAVAIL);
+                                               sip_queue_hangup_cause(p, AST_CAUSE_BEARERCAPABILITY_NOTAVAIL);
+                                       }
                                }
                        }
                        ast_rtp_instance_activate(p->rtp);