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This is an automatically generated e-mail. To reply, visit:
<a href="https://reviewboard.asterisk.org/r/1053/">https://reviewboard.asterisk.org/r/1053/</a>
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<p style="margin-top: 0;">On December 9th, 2010, 9:59 a.m., <b>David Vossel</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/1053/diff/1/?file=14445#file14445line7581" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/channels/chan_sip.c</a>
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(Diff revision 1)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int sip_subscribe_mwi(const char *value, int lineno)</pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">sip_parse_host</span><span class="p">(</span><span class="n">buf</span><span class="p">,</span> <span class="n">lineno</span><span class="p">,</span> <span class="o">&</span><span class="n">username</span><span class="p">,</span> <span class="o">&</span><span class="n">portnum</span><span class="p">,</span> <span class="o">&</span><span class="n">transport</span><span class="p">);</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">((</span><span class="n">hostname</span> <span class="o">=</span> <span class="n">strrchr</span><span class="p">(</span><span class="n">buf</span><span class="p">,</span> <span class="sc">'@'</span><span class="p">)))</span> <span class="p">{</span></pre></td>
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<td bgcolor="#ffc5ce" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="ew"> </span></pre></td>
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<td bgcolor="#ffc5ce" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">((</span><span class="n">hostname</span> <span class="o">=</span> <span class="n">strrchr</span><span class="p">(</span><span class="n">username</span><span class="p">,</span> <span class="sc">'@'</span><span class="p">)))</span> <span class="p">{</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="o">*</span><span class="n">hostname</span><span class="o">++</span> <span class="o">=</span> <span class="sc">'\0'</span><span class="p">;</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="o">*</span><span class="n">hostname</span><span class="o">++</span> <span class="o">=</span> <span class="sc">'\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; "> <span class="n">username</span> <span class="o">=</span> <span class="n">buf</span><span class="p">;</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="p">}</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="p">}</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">((</span><span class="n">secret</span> <span class="o">=</span> <span class="n">strchr</span><span class="p">(</span><span class="n">username</span><span class="p">,</span> <span class="sc">':'</span><span class="p">)))</span> <span class="p">{</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">((</span><span class="n">secret</span> <span class="o">=</span> <span class="n">strchr</span><span class="p">(</span><span class="n">username</span><span class="p">,</span> <span class="sc">':'</span><span class="p">)))</span> <span class="p">{</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="o">*</span><span class="n">secret</span><span class="o">++</span> <span class="o">=</span> <span class="sc">'\0'</span><span class="p">;</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="o">*</span><span class="n">secret</span><span class="o">++</span> <span class="o">=</span> <span class="sc">'\0'</span><span class="p">;</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">((</span><span class="n">authuser</span> <span class="o">=</span> <span class="n">strchr</span><span class="p">(</span><span class="n">secret</span><span class="p">,</span> <span class="sc">':'</span><span class="p">)))</span> <span class="p">{</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">((</span><span class="n">authuser</span> <span class="o">=</span> <span class="n">strchr</span><span class="p">(</span><span class="n">secret</span><span class="p">,</span> <span class="sc">':'</span><span class="p">)))</span> <span class="p">{</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="o">*</span><span class="n">authuser</span><span class="o">++</span> <span class="o">=</span> <span class="sc">'\0'</span><span class="p">;</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="o">*</span><span class="n">authuser</span><span class="o">++</span> <span class="o">=</span> <span class="sc">'\0'</span><span class="p">;</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="p">}</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="p">}</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="p">}</span></pre></td>
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<td bgcolor="#ffffff" 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;">if no '@' character is present in buf, username will remain NULL. Doing a strchr on a NULL pointer will crash I believe.
Are you familiar with our ability to perform unit tests? Parsing functions like this are great areas to make unit tests.</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;">Oh boy, nice mistake there... :/
In fixing one crash bug I precisely replicated the exact kind of bug. :)
Also, I hear your and Russell's comments about a unit test. Good call, and I'll go figure out how that works and update this review.</pre>
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<p>- Marquis</p>
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<p>On December 9th, 2010, 8:49 a.m., Marquis wrote:</p>
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<div>Review request for Asterisk Developers.</div>
<div>By Marquis.</div>
<p style="color: grey;"><i>Updated 2010-12-09 08:49:25</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;">Modify the parsing of mwi subscription lines in sip.conf in order to avoid an existing segfault and to have it properly populate the struct for subscriptions.</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;">Added lines for various possible permutations (kept in the diff for documentation) as well as temporary (not in the diff) debug lines to verify all strings were set to their expected values. Reporter in issue 18350 also applied patch and verified that his segfault was gone and that subscriptions were working.</pre>
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<b style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Bugs: </b>
<a href="https://issues.asterisk.org/view.php?id=18350">18350</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/channels/chan_sip.c <span style="color: grey">(297775)</span></li>
<li>/branches/1.8/configs/sip.conf.sample <span style="color: grey">(297775)</span></li>
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<p><a href="https://reviewboard.asterisk.org/r/1053/diff/" style="margin-left: 3em;">View Diff</a></p>
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