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This is an automatically generated e-mail. To reply, visit:
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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;">I don't think this approach is going to work either.</pre>
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<a href="https://reviewboard.asterisk.org/r/1353/diff/2/?file=18593#file18593line1202" style="color: black; font-weight: bold; text-decoration: underline;">trunk/channels/chan_local.c</a>
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(Diff revision 2)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static struct ast_channel *local_request(const char *type, struct ast_format_cap *cap, const struct ast_channel *requestor, void *data, int *cause)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">1202</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">(</span><span class="n">requestor</span><span class="o">-></span><span class="n">parent</span><span class="p">)</span> <span class="p">{</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">1203</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">p</span><span class="o">-></span><span class="n">owner</span><span class="o">-></span><span class="n">parent</span> <span class="o">=</span> <span class="n">p</span><span class="o">-></span><span class="n">chan</span><span class="o">-></span><span class="n">parent</span> <span class="o">=</span> <span class="p">(</span><span class="k">struct</span> <span class="n">ast_channel</span> <span class="o">*</span><span class="p">)</span> <span class="n">requestor</span><span class="o">-></span><span class="n">parent</span><span class="p">;</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">1204</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="p">}</span> <span class="k">else</span> <span class="p">{</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">p</span><span class="o">-></span><span class="n">owner</span><span class="o">-></span><span class="n">parent</span> <span class="o">=</span> <span class="n">p</span><span class="o">-></span><span class="n">chan</span><span class="o">-></span><span class="n">parent</span> <span class="o">=</span> <span class="p">(</span><span class="k">struct</span> <span class="n">ast_channel</span> <span class="o">*</span><span class="p">)</span> <span class="n">requestor</span><span class="p">;</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="p">}</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">This will need to be done for all channel drivers.</pre>
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<a href="https://reviewboard.asterisk.org/r/1353/diff/2/?file=18595#file18595line746" style="color: black; font-weight: bold; text-decoration: underline;">trunk/include/asterisk/channel.h</a>
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(Diff revision 2)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">enum ast_t38_state {</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">struct</span> <span class="n">ast_channel</span> <span class="o">*</span><span class="n">parent</span><span class="p">;</span> <span class="cm">/*!< Channel that intiated the call */</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Adding this to ast_channel breaks ABI compatibility.</pre>
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<a href="https://reviewboard.asterisk.org/r/1353/diff/2/?file=18596#file18596line6956" style="color: black; font-weight: bold; text-decoration: underline;">trunk/main/features.c</a>
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(Diff revision 2)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int manager_park(struct mansession *s, const struct message *m)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">(</span><span class="n">chan</span><span class="o">-></span><span class="n">parent</span><span class="p">)</span> <span class="p">{</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">parent</span> <span class="o">=</span> <span class="n">chan</span><span class="o">-></span><span class="n">parent</span><span class="p">;</span></pre></td>
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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">6958</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">while</span> <span class="p">(</span><span class="n">parent</span><span class="o">-></span><span class="n">parent</span><span class="p">)</span> <span class="p">{</span></pre></td>
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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">6959</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">parent</span> <span class="o">=</span> <span class="n">parent</span><span class="o">-></span><span class="n">parent</span><span class="p">;</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="p">}</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">(</span> <span class="o">!</span><span class="n">ast_channel_datastore_find</span><span class="p">(</span><span class="n">parent</span><span class="p">,</span> <span class="o">&</span><span class="n">pickup_active</span><span class="p">,</span> <span class="nb">NULL</span><span class="p">))</span> <span class="p">{</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">return</span> <span class="mi">1</span><span class="p">;</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="p">}</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">return</span> <span class="mi">0</span><span class="p">;</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">6966</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="p">}</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Walking this list is dangerous since the list is hopping through ast_channel structs that you don't have the locks on.
The call to ast_channel_datastore_find() must be called with that channel locked.</pre>
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<a href="https://reviewboard.asterisk.org/r/1353/diff/2/?file=18596#file18596line7043" style="color: black; font-weight: bold; text-decoration: underline;">trunk/main/features.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">int ast_pickup_call(struct ast_channel *chan)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">(</span><span class="n">parent</span><span class="p">)</span> <span class="p">{</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">while</span> <span class="p">(</span><span class="n">parent</span><span class="o">-></span><span class="n">parent</span><span class="p">)</span> <span class="p">{</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">parent</span> <span class="o">=</span> <span class="n">parent</span><span class="o">-></span><span class="n">parent</span><span class="p">;</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="p">}</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">/* Mark the target's parent to block any call pickup race. */</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">parent_ds_pickup</span> <span class="o">=</span> <span class="n">ast_datastore_alloc</span><span class="p">(</span><span class="o">&</span><span class="n">pickup_active</span><span class="p">,</span> <span class="nb">NULL</span><span class="p">);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">7050</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="n">parent_ds_pickup</span><span class="p">)</span> <span class="p">{</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_log</span><span class="p">(</span><span class="n">LOG_WARNING</span><span class="p">,</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="s">"Unable to create parent channel datastore on '%s' for call pickup</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span> <span class="n">parent</span><span class="o">-></span><span class="n">name</span><span class="p">);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">return</span> <span class="o">-</span><span class="mi">1</span><span class="p">;</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="p">}</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_channel_datastore_add</span><span class="p">(</span><span class="n">parent</span><span class="p">,</span> <span class="n">parent_ds_pickup</span><span class="p">);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="p">}</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Walking this list is dangerous. You don't have the locks for each channel.
Calling ast_channel_datastore_add() requires the affected channel to be locked.</pre>
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<a href="https://reviewboard.asterisk.org/r/1353/diff/2/?file=18596#file18596line7064" style="color: black; font-weight: bold; text-decoration: underline;">trunk/main/features.c</a>
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(Diff revision 2)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">int ast_pickup_call(struct ast_channel *chan)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="n">ast_channel_datastore_remove</span><span class="p">(</span><span class="n">parent</span><span class="p">,</span> <span class="n">parent_ds_pickup</span><span class="p">))</span> <span class="p">{</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Parent must be locked before calling ast_channel_datastore_remove().</pre>
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<a href="https://reviewboard.asterisk.org/r/1353/diff/2/?file=18596#file18596line7124" style="color: black; font-weight: bold; text-decoration: underline;">trunk/main/features.c</a>
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(Diff revision 2)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">int ast_do_pickup(struct ast_channel *chan, struct ast_channel *target)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="n">ast_channel_datastore_remove</span><span class="p">(</span><span class="n">parent</span><span class="p">,</span> <span class="n">parent_ds_pickup</span><span class="p">))</span> <span class="p">{</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Parent must be locked before calling ast_channel_datastore_remove().</pre>
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<p>- rmudgett</p>
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<p>On August 25th, 2011, 7:19 a.m., Alec Davis wrote:</p>
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<div>Review request for Asterisk Developers and rmudgett.</div>
<div>By Alec Davis.</div>
<p style="color: grey;"><i>Updated Aug. 25, 2011, 7:19 a.m.</i></p>
<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;">If ast_can_pickup() can pickup the target channel, it also needs to check that the originating parent channel isn't being picked up from one of the other spawned the calls.
Example dialplan below causes a segfault as ast-hangup removes the same channel as is being picked up.
How to crash it!
dial 801 from 1 phone.
from 2 phones simultaneously dial 800.
segfault!
exten => 801,1,NoOp(Local pickup debug: Ring Phones)
exten => 801,n,Dial(Local/823@en-phone&Local/824@en-phone)
exten => 800,1,NoOp(Local pickup: Pickup through Localchan call)
exten => 800,n,Dial(Local/824@en-pickup&Local/823@en-pickup)
[en-pickup]
exten => _[0-9*#]!, 1, PickupChan(Local/${EXTEN}@en-phone)
[en-phone]
exten => _[0-9*#]!, 1, Dial(SIP/gxp-${EXTEN},20,rwt)
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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;">Party A ring in which triggers off 2 internal localchan calls, as per 801 in the example dialplan.
Party B and Party C, attempt to pickup the same calls, using 800 in the example dialplan.
There is another senario thats not right, before even applying this patch.
Party A ring in, which again triggers 2 internal localchan calls as per 801 in dialplan.
Party B and Party C, use *8 to pickup. We then have a NULL OBJ message on screen, and an orpaned channel.
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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/ASTERISK-18222">ASTERISK-18222</a>,
<a href="https://issues.asterisk.org/jira/browse/ASTERISK-18273">ASTERISK-18273</a>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>trunk/channels/chan_local.c <span style="color: grey">(333199)</span></li>
<li>trunk/channels/chan_sip.c <span style="color: grey">(333199)</span></li>
<li>trunk/include/asterisk/channel.h <span style="color: grey">(333199)</span></li>
<li>trunk/main/features.c <span style="color: grey">(333199)</span></li>
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<p><a href="https://reviewboard.asterisk.org/r/1353/diff/" style="margin-left: 3em;">View Diff</a></p>
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