<p>This is a workaround for <a href="https://github.com/OpenSIPS/opensips/issues/721" class="issue-link" title="SIGSEGV in pkg_malloc/fm_malloc">#721</a> <br>
This doesn't address the base question (why would a fragement have <code>-&gt;prev</code> set to NULL), so this isn't a fix, but it should prevent crashes for this case.</p>

<hr>

<h4>You can view, comment on, or merge this pull request online at:</h4>
<p>&nbsp;&nbsp;<a href='https://github.com/OpenSIPS/opensips/pull/722'>https://github.com/OpenSIPS/opensips/pull/722</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>Prevent crash in `fm_remove_free`.</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/OpenSIPS/opensips/pull/722/files#diff-0">mem/f_malloc.c</a>
    (2)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/OpenSIPS/opensips/pull/722.patch'>https://github.com/OpenSIPS/opensips/pull/722.patch</a></li>
  <li><a href='https://github.com/OpenSIPS/opensips/pull/722.diff'>https://github.com/OpenSIPS/opensips/pull/722.diff</a></li>
</ul>

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