[asterisk-dev] [Code Review] 2834: res_pjsip: Fix crash when configuration system fails

[Corey Farrell]

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Please take a look at Joshua's patch on ASTERISK-22474.  Your patch partially addresses test #1 from that ticket; core stop gracefully from test #1 gave me a segfault with your patch.  Your patch also does not fix test #2.

- Corey Farrell


On Sept. 6, 2013, 10:15 p.m., Matt Jordan wrote:
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> https://reviewboard.asterisk.org/r/2834/
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> (Updated Sept. 6, 2013, 10:15 p.m.)
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> 
> Review request for Asterisk Developers.
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> Repository: Asterisk
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> 
> Description
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> 
> While playing around with Asterisk, I managed to tell it to load res_pjsip and friends with no sorcery wizards loaded. This resulted in the following crash:
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> Thread 1 (Thread 0x7f1af1ada760 (LWP 6119)):
> #0  ast_threadpool_push (pool=0x0, task=0x7f1aba1d0880 <sync_task>, data=0x7fff1e4157a0)
>     at threadpool.c:896
> #1  0x00007f1aba1d2aec in ast_sip_push_task_synchronous (serializer=0x0, 
>     sip_task=0x7f1aba1d0f70 <unregister_service>, task_data=0x7fff1e415858) at res_pjsip.c:1694
> #2  0x00007f1aba1d2b7c in ast_sip_unregister_service (module=0x7f1aba3e4180) at res_pjsip.c:1050
> #3  0x00007f1aba1d7820 in ast_sip_destroy_distributor () at res_pjsip/pjsip_distributor.c:368
> #4  0x00007f1aba1d0c7a in load_module () at res_pjsip.c:1886
> #5  load_module () at res_pjsip.c:1803
> #6  0x000000000051420f in start_resource (mod=0x1771800) at loader.c:971
> #7  0x0000000000514a5a in start_resource (mod=<optimized out>) at loader.c:964
> #8  load_resource_list (load_order=0x7fff1e415a80, global_symbols=1, mod_count=0x7fff1e415a9c)
>     at loader.c:1174
> #9  0x000000000051661a in load_modules (preload_only=<optimized out>) at loader.c:1322
> #10 0x000000000042ffdd in main (argc=<optimized out>, argv=<optimized out>) at asterisk.c:4431
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> Basically, since sorcery can't load the configuration, you jump to the error: label and call ast_sip_destroy_distributor with no threadpool allocated. Kerblooey.
> 
> This patch checks for this in ast_sip_unregister_service, which feels like the most appropriate place as you shouldn't push a task to unregister a service if you don't have a serializer/threadpool. I'm open to other suggestions on where to catch this however.
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> 
> Diffs
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>   /branches/12/res/res_pjsip.c 398627 
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> Diff: https://reviewboard.asterisk.org/r/2834/diff/
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> 
> Testing
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> 
> Thanks,
> 
> Matt Jordan
> 
>

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