[asterisk-bugs] [Asterisk 0019192]: segfault in _sip_tcp_helper_thread() caused by bad merge in r314628

[Asterisk Bug Tracker]

The following issue has been SUBMITTED. 
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https://issues.asterisk.org/view.php?id=19192 
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Reported By:                stknob
Assigned To:                
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Project:                    Asterisk
Issue ID:                   19192
Category:                   Channels/chan_sip/General
Reproducibility:            always
Severity:                   crash
Priority:                   normal
Status:                     new
Asterisk Version:           1.8.3.3 
JIRA:                        
Regression:                 No 
Reviewboard Link:            
SVN Branch (only for SVN checkouts, not tarball releases): N/A 
SVN Revision (number only!):  
Request Review:              
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Date Submitted:             2011-04-27 11:43 CDT
Last Modified:              2011-04-27 11:43 CDT
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Summary:                    segfault in _sip_tcp_helper_thread() caused by bad
merge in r314628
Description: 
This happens if ast_tcptls_session_start() in _sip_tcp_helper_thread() on
line 2506 in chan_sip.c fails (returns NULL).

To reproduce, 
  - create a tcp sip peer that can not be reached (e.g. blocked by
firewall)
  - use sip qualify peer X  (or set qualify=yes in sip.conf)

chan_sip will try to create the connection by calling
ast_tcptls_session_start().
the connection fails and ast_tcptls_session_start() returns NULL:

   if ((!(ca = tcptls_session->parent)) ||
        (!(me = ao2_t_find(threadt, &tmp, OBJ_POINTER, "ao2_find, getting
sip_threadinfo in tcp helper thread"))) ||
         (!(tcptls_session = ast_tcptls_client_start(tcptls_session)))) {
               goto cleanup;
   }

setting tcptls_session to NULL and jumping to cleanup:

   cleanup:
        if (!tcptls_session->client && !authenticated) {
                ast_atomic_fetchadd_int(&unauth_sessions, -1);
        }

*boom*
asterisk[8204]: segfault at 18 ip 00007f497d4499f0 sp 00007f4966ef5450
error 4 in chan_sip.so[7f497d3c7000+a6000]
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Issue History 
Date Modified    Username       Field                    Change               
====================================================================== 
2011-04-27 11:43 stknob         New Issue                                    
2011-04-27 11:43 stknob         Asterisk Version          => 1.8.3.3         
2011-04-27 11:43 stknob         Regression                => No              
2011-04-27 11:43 stknob         SVN Branch (only for SVN checkouts, not tarball
releases) => N/A             
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