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This is an automatically generated e-mail. To reply, visit:
<a href="https://reviewboard.asterisk.org/r/3337/">https://reviewboard.asterisk.org/r/3337/</a>
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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;">(1) Don't forget to close out the findings once they're fixed!
(2) If you can, do file an issue in the ASTERISK project (if there isn't one already) related to this issue. When release summaries/announcements are made, it looks for the issue in the tracker. That helps people know what issues have been resolved.</pre>
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<a href="https://reviewboard.asterisk.org/r/3337/diff/3/?file=57634#file57634line1339" style="color: black; font-weight: bold; text-decoration: underline;">http://svn.asterisk.org/svn/asterisk/branches/11/res/res_rtp_asterisk.c</a>
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(Diff revision 3)
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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="tb"> </span><span class="tb"> </span><span class="n">ao2_ref</span><span class="p">(</span><span class="n">instance</span><span class="p">,</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="tb"> </span><span class="tb"> </span><span class="n">ast_mutex_unlock</span><span class="p">(</span><span class="o">&</span><span class="n">rtp</span><span class="o">-></span><span class="n">dtls_timer_lock</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;">I think I was wrong in the order of operations here in my original finding (sorry). Since rtp is a property of instance, de'refing instance here first before unlocking it risks having the instance object being destroyed, which would also potentially destroy rtp. This should be:
ast_mutex_unlock(&rtp->dtls_timer_lock);
ao2_ref(instance, -1);</pre>
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<a href="https://reviewboard.asterisk.org/r/3337/diff/3/?file=57634#file57634line1347" style="color: black; font-weight: bold; text-decoration: underline;">http://svn.asterisk.org/svn/asterisk/branches/11/res/res_rtp_asterisk.c</a>
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(Diff revision 3)
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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="k">if</span> <span class="p">(</span><span class="n">rtp</span> <span class="o">&&</span> <span class="n">rtp</span><span class="o">-></span><span class="n">ssl</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="tb"> </span><span class="tb"> </span><span class="n">DTLSv1_handle_timeout</span><span class="p">(</span><span class="n">rtp</span><span class="o">-></span><span class="n">ssl</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="tb"> </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;">Checking for rtp being a valid pointer is no longer necessary here, since you bail if rtp is NULL previously.</pre>
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<p>- Matt Jordan</p>
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<p>On April 18th, 2014, 10:14 a.m. CDT, Nitesh Bansal wrote:</p>
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<div>Review request for Asterisk Developers.</div>
<div>By Nitesh Bansal.</div>
<p style="color: grey;"><i>Updated April 18, 2014, 10:14 a.m.</i></p>
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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;">This patch adds the code to do the DTLS retransmissions in Asterisk.</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;">I tested this with a basic SIPP script, which fakes a DTLS INVITE.
Asterisk thinks that it is a DTLS call and inititates the DTLS handshake. SIPP doesn't respond to DTLS handshake, which causes the DTLS timeout and DTLS retransmission takes place.
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>http://svn.asterisk.org/svn/asterisk/branches/11/res/res_rtp_asterisk.c <span style="color: grey">(412566)</span></li>
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<p><a href="https://reviewboard.asterisk.org/r/3337/diff/" style="margin-left: 3em;">View Diff</a></p>
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