[asterisk-dev] [Code Review] 4460: res_pjsip_refer: Fix occasional unexpected BYE sent after receiving a REFER.

[Mark Michelson]

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Logically, this looks sound. Structurally, I agree with Ashley's comments. However, I subscribe to the school of fixing bugs in one commit and making structural improvements in a separate commit if they're not directly related to the bug being fixed (in fact, I would eschew some of the formatting changes you've introduced in this review already). So I'd be okay if this got committed as-is and a separate commit were made after to address Ashley's findings. Or if you'd rather knock it all out in one go, do it that way.

- Mark Michelson


On March 4, 2015, 5:31 p.m., rmudgett wrote:
> 
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> (Updated March 4, 2015, 5:31 p.m.)
> 
> 
> Review request for Asterisk Developers.
> 
> 
> Bugs: ASTERISK-24755
>     https://issues.asterisk.org/jira/browse/ASTERISK-24755
> 
> 
> Repository: Asterisk
> 
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> Description
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> 
> A race condition happened between initiating a transfer and requesting
> that a dialog termination be delayed.  Occasionally, the transferrer
> channels would exit the bridge and hangup before the dialog termination
> was requested.
> 
> * Made request dialog termination delay before initiating the transfer
> action.  If the transfer fails then cancel the delayed dialog termination
> request.
> 
> * Made safely get the TRANSFER_CONTEXT channel value while the channel is
> locked in refer_incoming_attended_request() and
> refer_incoming_blind_request().  The pointer returned by
> pbx_builtin_getvar_helper() is only valid while the channel is locked.
> 
> * Made refer_attended_alloc() not create the ao2 object with an unneeded
> lock.
> 
> 
> Diffs
> -----
> 
>   /branches/13/res/res_pjsip_session.exports.in 432446 
>   /branches/13/res/res_pjsip_session.c 432446 
>   /branches/13/res/res_pjsip_refer.c 432446 
>   /branches/13/include/asterisk/res_pjsip_session.h 432446 
> 
> Diff: https://reviewboard.asterisk.org/r/4460/diff/
> 
> 
> Testing
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> 
> The testsuite tests/channels/pjsip/ tests still pass with the patch.
> 
> 
> Thanks,
> 
> rmudgett
> 
>

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