Fix a race condition in res_pjsip_session with rapidly terminating the session.

The INVITE session state callback wrongly assumes that a session will always exist, but
when rapidly terminating the session this assumption goes out the window. As all handler
code for the INVITE session state callback requires the session it will now just exit
immediately if no session exists.

(closes issue ASTERISK-22668)
Reported by: John Bigelow

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/12@400872 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/res/res_pjsip_session.c b/res/res_pjsip_session.c
index a186bf67ca29a7bf8b054787a5a003cf95ac81b7..4dae4b4830f8c875f3a820506ead90e61a64e3bb 100644 (file)
--- a/res/res_pjsip_session.c
+++ b/res/res_pjsip_session.c
@@ -1814,6 +1814,10 @@ static void session_inv_on_state_changed(pjsip_inv_session *inv, pjsip_event *e)
 
        print_debug_details(inv, NULL, e);
 
+       if (!session) {
+               return;
+       }
+
        switch(e->type) {
        case PJSIP_EVENT_TX_MSG:
                handle_outgoing(session, e->body.tx_msg.tdata);