[asterisk-dev] [Code Review] 4608: res_pjsip_phoneprov_provider: Fix reference leak on unload

[Corey Farrell]

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I think I still prefer ao2_callback over ao2_iterator for taking an action against every object in a container, but don't feel strongly enough to hold this up.  Minor nit with the return value, then we can ship this.


branches/13/res/res_pjsip_phoneprov_provider.c
<https://reviewboard.asterisk.org/r/4608/#comment25828>

    If we're sticking with the ao2_iterator lets loose the 'int' return, just make this function void.



branches/13/res/res_pjsip_phoneprov_provider.c
<https://reviewboard.asterisk.org/r/4608/#comment25827>

    Remove..



branches/13/res/res_pjsip_phoneprov_provider.c
<https://reviewboard.asterisk.org/r/4608/#comment25826>

    To record our brief discussion about this change:
    <coreyfarrell> gtjoseph: so one thing I don't see how using an ao2_iterator instead of ao2_callback in users_apply_handler makes it more straight forward..
    <coreyfarrell> I don't want to hold up the fix, but that change doesn't make much sense to me
    <gtjoseph> there's no worry about the callback return value, OBJ_NODATA, etc.  Get the container and iterate over it.   It also eliminates a lot of overhead in the ao2_traversal code.
    <gtjoseph> unless the callback is controlling the traversal with it's return code, there's no point.


- Corey Farrell


On April 9, 2015, 3:20 p.m., George Joseph wrote:
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> This is an automatically generated e-mail. To reply, visit:
> https://reviewboard.asterisk.org/r/4608/
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> 
> (Updated April 9, 2015, 3:20 p.m.)
> 
> 
> Review request for Asterisk Developers and Corey Farrell.
> 
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> Bugs: ASTERISK-24935
>     https://issues.asterisk.org/jira/browse/ASTERISK-24935
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> Repository: Asterisk
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> Description
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> res_pjsip_phoneprov_provider was leaking references to phoneprov objects due to a missing OBJ_NODATA in an ao2_callback in load_users().  Rather than adding the OBJ_NODATA, I changed load_users to use a more straightforward ao2_iterator.  This plugged the leak but exposed an unload order issue between res_pjsip_phoneprov_provider, res_phoneprov and res_pjsip.
> 
> res_pjsip_phoneprov_provider unloads first, then res_phoneprov, then res_pjsip.  Since res_pjsip_phoneprov_provider uses res_pjsip's sorcery instance, when it unloads, it's objects are still in the sorcery instance.  When res_pjsip unloads, it destroys all its objects including res_pjsip_phoneprov_provider's.  The phoneprov destructor then attempts to unregister the extension from res_phoneprov but because res_phoneprov is already cleaned up, its users container is gone and we get a FRACK.
> 
> Simple solution, check for the NULL users container before attempting to remove the entry. Duh.
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> Diffs
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>   branches/13/res/res_pjsip_phoneprov_provider.c 434447 
>   branches/13/res/res_phoneprov.c 434447 
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> Diff: https://reviewboard.asterisk.org/r/4608/diff/
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> Testing
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> Ran tests/res_phoneprov/res_phoneprov_provider.  No leaks in res_pjsip_phoneprov_provider and no FRACKs.
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> 
> Thanks,
> 
> George Joseph
> 
>

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