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      <base href="https://bugs.freedesktop.org/" />
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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Priority</th>
          <td>medium
          </td>
        </tr>

        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - NULL pointer dereference : _clip_and_composite_boxes() tries to destroy __cairo_clip_all's path"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=77931">77931</a>
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>psychon@znc.in
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>NULL pointer dereference : _clip_and_composite_boxes() tries to destroy __cairo_clip_all's path
          </td>
        </tr>

        <tr>
          <th>QA Contact</th>
          <td>cairo-bugs@cairographics.org
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>tetromino@gentoo.org
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>Other
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>1.12.16
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>xcb backend
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>cairo
          </td>
        </tr></table>
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        <div>
        <pre>(As reported downstream at <a href="https://bugs.gentoo.org/show_bug.cgi?id=507478">https://bugs.gentoo.org/show_bug.cgi?id=507478</a>)

Gentoo users who tried linking firefox-28 with vanilla cairo-1.12.16 with the
xcb backend enabled (instead of using the patched cairo that's bundled with
firefox) have reported NULL pointer dereferences in _cairo_clip_path_destroy().

The crash is caused by _clip_and_composite_boxes() failing to check whether the
clip path being freed belongs to the constant __cairo_clip_all.</pre>
        </div>
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