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This is an automatically generated e-mail. To reply, visit:
<a href="https://reviewboard.asterisk.org/r/2103/">https://reviewboard.asterisk.org/r/2103/</a>
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<p style="margin-top: 0;">On September 11th, 2012, 9:39 a.m., <b>Matt Jordan</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/2103/diff/2/?file=31167#file31167line959" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/main/features.c</a>
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(Diff revision 2)
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<td colspan="2"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
<td colspan="2"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int set_chan_app_data(struct ast_channel *chan, const char *src_app_data)</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">datastore</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="o">-</span><span class="mi">1</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">961</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="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Some WARNING log messages (or ERROR) when the memory allocation fails would be good.</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;">This is already taken care of by the internal memory management code I believe.</pre>
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<p>- Sean</p>
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<p>On September 10th, 2012, 11:58 a.m., Mark Michelson wrote:</p>
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<div>Review request for Asterisk Developers.</div>
<div>By Mark Michelson.</div>
<p style="color: grey;"><i>Updated Sept. 10, 2012, 11:58 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;">While attempting to track down the crash reported in ASTERISK-20335, I was able to trigger a series of valgrind warnings due to dangerous setting of channel's data pointer in ast_bridge_call_thread().
The data on channel A would be set to point to the name of channel B and vice-versa. The issue here is that if channel B gets freed, then channel A's data points to freed memory.
My method for fixing this is to essentially copy what Kevin Fleming recently did in main/cel.c where there was another channel data-related issue. I have created a datastore that contains a copy of the data string, and pointed the channel's data pointer at this allocated string. When the channel is destroyed, the datastore is destroyed along with it and the allocated string is freed. This way the lifetime of the channel's data is tied to its own lifetime rather than to the lifetime of a different channel.</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;">Ran a test scenario that involved an attended transfer failure. Without the patch, valgrind reports many invalid reads once the second channel hangs up. With the patch, valgrind reports no errors.</pre>
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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-20335">ASTERISK-20335</a>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>/branches/1.8/main/features.c <span style="color: grey">(371589)</span></li>
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<p><a href="https://reviewboard.asterisk.org/r/2103/diff/" style="margin-left: 3em;">View Diff</a></p>
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