[asterisk-bugs] [Asterisk 0012346]: null pointer in chan_skinny when 'regcontext' used

[noreply at bugs.digium.com]

A NOTE has been added to this issue. 
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http://bugs.digium.com/view.php?id=12346 
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Reported By:                candlerb
Assigned To:                mvanbaak
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Project:                    Asterisk
Issue ID:                   12346
Category:                   Channels/chan_skinny
Reproducibility:            always
Severity:                   crash
Priority:                   normal
Status:                     feedback
Asterisk Version:           SVN 
SVN Branch (only for SVN checkouts, not tarball releases): 1.6.0 
SVN Revision (number only!): 111962 
Disclaimer on File?:        N/A 
Request Review:              
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Date Submitted:             04-01-2008 03:57 CDT
Last Modified:              04-02-2008 11:30 CDT
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Summary:                    null pointer in chan_skinny when 'regcontext' used
Description: 
Uncomment the 'regcontext' example line from skinny.conf, wait for a Cisco
phone to connect, and Asterisk dumps core.

GDB output:

...
[New Thread -1215501408 (LWP 12516)]
    -- Starting Skinny session from 10.69.255.249
    -- Added extension '110' priority 1 to skinnyregistrations

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1215501408 (LWP 12516)]
ast_add_extension2 (con=0x86d1a88, replace=1, extension=0xb78ce1c0 "110",
    priority=Variable "priority" is not available.
) at pbx.c:6056
6056                            if (x->exten) { /* this test for safety
purposes */
(gdb) bt
http://bugs.digium.com/view.php?id=0  ast_add_extension2 (con=0x86d1a88,
replace=1, extension=0xb78ce1c0
"110",
    priority=Variable "priority" is not available.
) at pbx.c:6056
http://bugs.digium.com/view.php?id=1  0x080e4f71 in ast_add_extension
(context=0x363840
"skinnyregistrations",
    replace=141620640, extension=0x870f5a0 "??p\b", priority=141620640,
    label=0x870f5a0 "??p\b", callerid=0x870f5a0 "??p\b",
    application=0x870f5a0 "??p\b", data=0x870f5a0, datad=0x870f5a0,
    registrar=0x870f5a0 "??p\b") at pbx.c:5859
http://bugs.digium.com/view.php?id=2  0x00359a6f in handle_message
(req=0x870f180, s=0x870e600)
    at
/home/candlerb/svn/asterisk/branches/1.6.0/include/asterisk/utils.h:502
http://bugs.digium.com/view.php?id=3  0x0035b88f in skinny_session
(data=0x870e600) at chan_skinny.c:5585
http://bugs.digium.com/view.php?id=4  0x08122445 in dummy_start (data=0x86d1a88)
at utils.c:870
http://bugs.digium.com/view.php?id=5  0x005793cc in start_thread () from
/lib/tls/libpthread.so.0
http://bugs.digium.com/view.php?id=6  0x004d21ae in clone () from
/lib/tls/libc.so.6
(gdb) print x
$1 = (struct match_char *) 0x0

I wondered if this was perhaps because I had no [skinnyregistrations]
section in extensions.conf, but I added one and it made no difference.

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---------------------------------------------------------------------- 
 file - 04-02-08 11:30  
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I think I have an idea... can you grab a dialplan show before you cause it
to crash, and a thread apply all bt when you do? 

Issue History 
Date Modified   Username       Field                    Change               
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04-02-08 11:30  file           Note Added: 0084931                          
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