<html>
    <head>
      <base href="https://bugs.webkit.org/" />
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Memory is written to after deallocated, in GraphicsLayer::setMaskLayer."
   href="https://bugs.webkit.org/show_bug.cgi?id=141168">141168</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Memory is written to after deallocated, in GraphicsLayer::setMaskLayer.
          </td>
        </tr>

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

        <tr>
          <th>Product</th>
          <td>WebKit
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>528+ (Nightly build)
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>Unspecified
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Unspecified
          </td>
        </tr>

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

        <tr>
          <th>Severity</th>
          <td>Normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P2
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>WebCore Misc.
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>webkit-unassigned@lists.webkit.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>peavo@outlook.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Visual Studio detected that a deallocated heap block had been modified in GraphicsLayer::setMaskLayer, when called from RenderLayerBacking::updateChildClippingStrategy.

void GraphicsLayer::setMaskLayer(GraphicsLayer* layer)
{
    if (layer == m_maskLayer)
        return;

    if (layer) {
        layer->removeFromParent();
        layer->setParent(this);
        layer->setIsMaskLayer(true);
    } else if (m_maskLayer) {
        m_maskLayer->setParent(nullptr);    <--------------- Writing to deallocated memory
        m_maskLayer->setIsMaskLayer(false); <---------------
    }

    m_maskLayer = layer;
}</pre>
        </div>
      </p>
      <hr>
      <span>You are receiving this mail because:</span>
      
      <ul>
          <li>You are the assignee for the bug.</li>
      </ul>
    </body>
</html>