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This is an automatically generated e-mail. To reply, visit:
<a href="https://reviewboard.asterisk.org/r/3954/">https://reviewboard.asterisk.org/r/3954/</a>
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<p style="margin-top: 0;">On September 11th, 2014, 10:16 a.m. CDT, <b>Joshua Colp</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/3954/diff/4/?file=67305#file67305line2488" style="color: black; font-weight: bold; text-decoration: underline;">/branches/13/res/res_pjsip.c</a>
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(Diff revision 4)
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="cm">/*</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"><span class="tb"> </span><span class="tb"> </span> * </span><span class="cs">XXX</span><span class="cm"> Unfortunately we cannot report failure here because</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"><span class="tb"> </span><span class="tb"> </span> * pjsip_endpt_send_request() may or may not call the</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"><span class="tb"> </span><span class="tb"> </span> * callback on error.</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"><span class="tb"> </span><span class="tb"> </span> *</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"><span class="tb"> </span><span class="tb"> </span> * It appears that the callback will be called for normal</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"><span class="tb"> </span><span class="tb"> </span> * error conditions like unknown endpoint transports. Paths</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"><span class="tb"> </span><span class="tb"> </span> * where it won't be called are passing invalid parameters</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"><span class="tb"> </span><span class="tb"> </span> * and malloc errors.</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"><span class="tb"> </span><span class="tb"> </span> *</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"><span class="tb"> </span><span class="tb"> </span> * As a result we shouldn't return error so callers will</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"><span class="tb"> </span><span class="tb"> </span> * not be tempted to free things that cannot be reliably</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"><span class="tb"> </span><span class="tb"> </span> * freed.</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"><span class="tb"> </span><span class="tb"> </span> */</span></pre></td>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Looking at the pjproject code why wouldn't the following return values cover these cases for when the callback is not called:
PJ_EINVAL
PJ_EINVALIDOP
PJ_ENOMEM
Handling those as special would reduce the memory leak possibility.</pre>
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Almost any value could be returned because user supplied callbacks could fail with any error code they think is reasonable. Most of those transport callback routines can return PJ_EINVAL when they sanity check the parameters. If it was going out over a websocket transport the PJ_ENOMEM value could be returned. The safeset thing that can be done is to not free anything.</pre>
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<p>- rmudgett</p>
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<p>On September 10th, 2014, 5:18 p.m. CDT, rmudgett wrote:</p>
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<div>Review request for Asterisk Developers.</div>
<div>By rmudgett.</div>
<p style="color: grey;"><i>Updated Sept. 10, 2014, 5:18 p.m.</i></p>
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<b style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Bugs: </b>
<a href="https://issues.asterisk.org/jira/browse/AFS-155">AFS-155</a>,
<a href="https://issues.asterisk.org/jira/browse/ASTERISK-24295">ASTERISK-24295</a>
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<b style="color: #575012; font-size: 10pt;">Repository: </b>
Asterisk
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Description </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">The crash on the issues is a result of an invalid transport configuration change when asterisk is restarted. The attempt to send the qualify request fails and we cleaned up. However, the callback is also called which results in a double unref of the objects involved.
* Fixed send_request_cb() and qualify_contact_cb() to not cleanup the token when the PJSIP event is PJSIP_EVENT_TRANSPORT_ERROR since the initial function call will do the clean up.
* Made send_request_cb() able to handle repeated challenges (Up to 10).
* Fix periodic endpoint qualify OPTIONS sched deletion race by avoiding it. The sched entry will no longer self stop and must be externally stopped.
* Added REF_DEBUG description tags to struct sched_data in pjsip_options.c.
* Fix some off-nominal ref leaks in schedule_qualify(), qualify_and_schedule().
* Reordered pjsip_options.c module start/stop code to cleanup better on error.</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Testing </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">* With the qualify_frequency option enabled, added and removed a "local_net=" line in the transport section and restarted asterisk via "core restart now". Before the latest patch version, asterisk would crash. With the new patch, it keeps on going.
* Set the qualify_frequency option to different values and reloaded res_pjsip each time. The OPTIONS poll frequency changed, started, and stopped according to the new qualify_frequency value.</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>/branches/13/res/res_pjsip/pjsip_options.c <span style="color: grey">(422963)</span></li>
<li>/branches/13/res/res_pjsip.c <span style="color: grey">(422963)</span></li>
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<p><a href="https://reviewboard.asterisk.org/r/3954/diff/" style="margin-left: 3em;">View Diff</a></p>
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