<p>The ims_auth module reads the value from the Content-Length header<br>
of a REGISTER request, before decoding the message body.<br>
Due to a missing null pointer check, reading this value leads<br>
to core dump in case the Content-Length header is missing.</p>


<h4>Pre-Submission Checklist</h4>



<ul>
<li>[ x] Commit message has the format required by CONTRIBUTING guide</li>
<li>[ x] Commits are split per component (core, individual modules, libs, utils, ...)</li>
<li>[ x] Each component has a single commit (if not, squash them into one commit)</li>
<li>[ x] No commits to README files for modules (changes must be done to docbook files<br>
in <code>doc/</code> subfolder, the README file is autogenerated)</li>
</ul>
<h4>Type Of Change</h4>
<ul class="contains-task-list">
<li>[ x] Small bug fix (non-breaking change which fixes an issue)</li>
<li class="task-list-item"><input type="checkbox" class="task-list-item-checkbox" disabled=""> New feature (non-breaking change which adds new functionality)</li>
<li class="task-list-item"><input type="checkbox" class="task-list-item-checkbox" disabled=""> Breaking change (fix or feature that would change existing functionality)</li>
</ul>
<h4>Checklist:</h4>

<ul class="contains-task-list">
<li>[ x] PR should be backported to stable branches</li>
<li>[ x] Tested changes locally</li>
<li class="task-list-item"><input type="checkbox" class="task-list-item-checkbox" disabled=""> Related to issue #XXXX (replace XXXX with an open issue number)</li>
</ul>
<h4>Description</h4>

<p>Added a null pointer check in function ims_get_body() - file utils.c of<br>
module ims_auth - to check whether Content-Length Header was present<br>
in REGISTER message.<br>
If Content-Length Header is not present, a Default value of 0 will be assumed.</p>

<hr>

<h4>You can view, comment on, or merge this pull request online at:</h4>
<p>  <a href='https://github.com/kamailio/kamailio/pull/1213'>https://github.com/kamailio/kamailio/pull/1213</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>ims_auth: fixed rare core dump, due to null ptr check</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/kamailio/kamailio/pull/1213/files#diff-0">src/modules/ims_auth/utils.c</a>
    (4)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/kamailio/kamailio/pull/1213.patch'>https://github.com/kamailio/kamailio/pull/1213.patch</a></li>
  <li><a href='https://github.com/kamailio/kamailio/pull/1213.diff'>https://github.com/kamailio/kamailio/pull/1213.diff</a></li>
</ul>

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