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<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/171347">171347</a></dd>
<dt>Author</dt> <dd>mmaxfield@apple.com</dd>
<dt>Date</dt> <dd>2014-07-22 10:50:31 -0700 (Tue, 22 Jul 2014)</dd>
</dl>
<h3>Log Message</h3>
<pre>Source/WebCore: Clicking on links while accessibility is enabled sometimes crashes
https://bugs.webkit.org/show_bug.cgi?id=135074
Reviewed by Chris Fleizach.
When an accessibility request comes in from the system, we call updateBackingStore() on the
relevant AccessibilityObject, which triggers a relayout of the entire document. This relayout
might delete that accessibility node and its parent, which would cause the node to be deleted.
After the stack unwinds, we then call a member function on the node without checking for this
condition.
Test: accessibility/parent-delete.html
* accessibility/AccessibilityObject.cpp:
(WebCore::AccessibilityObject::updateBackingStore): Retain the node for the duration of the
function.
LayoutTests: Clicking on links while accessibility is enabled does not render as expected
https://bugs.webkit.org/show_bug.cgi?id=135074
Reviewed by Chris Fleizach.
Delete a node and its parent, then call allAttributes() on the accessibility representation of
the deleted child and make sure there is no crash.
* accessibility/parent-delete-expected.txt: Added
* accessibility/parent-delete.html: Added</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkLayoutTestsChangeLog">trunk/LayoutTests/ChangeLog</a></li>
<li><a href="#trunkSourceWebCoreChangeLog">trunk/Source/WebCore/ChangeLog</a></li>
<li><a href="#trunkSourceWebCoreaccessibilityAccessibilityObjectcpp">trunk/Source/WebCore/accessibility/AccessibilityObject.cpp</a></li>
</ul>
<h3>Added Paths</h3>
<ul>
<li><a href="#trunkLayoutTestsaccessibilityparentdeleteexpectedtxt">trunk/LayoutTests/accessibility/parent-delete-expected.txt</a></li>
<li><a href="#trunkLayoutTestsaccessibilityparentdeletehtml">trunk/LayoutTests/accessibility/parent-delete.html</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkLayoutTestsChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/LayoutTests/ChangeLog (171346 => 171347)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/ChangeLog        2014-07-22 17:32:38 UTC (rev 171346)
+++ trunk/LayoutTests/ChangeLog        2014-07-22 17:50:31 UTC (rev 171347)
</span><span class="lines">@@ -1,3 +1,16 @@
</span><ins>+2014-07-21 Myles C. Maxfield <mmaxfield@apple.com>
+
+ Clicking on links while accessibility is enabled does not render as expected
+ https://bugs.webkit.org/show_bug.cgi?id=135074
+
+ Reviewed by Chris Fleizach.
+
+ Delete a node and its parent, then call allAttributes() on the accessibility representation of
+ the deleted child and make sure there is no crash.
+
+ * accessibility/parent-delete-expected.txt: Added
+ * accessibility/parent-delete.html: Added
+
</ins><span class="cx"> 2014-07-22 Alexey Proskuryakov <ap@apple.com>
</span><span class="cx">
</span><span class="cx"> media/track/track-in-band-subtitles-too-large.html and
</span></span></pre></div>
<a id="trunkLayoutTestsaccessibilityparentdeleteexpectedtxt"></a>
<div class="addfile"><h4>Added: trunk/LayoutTests/accessibility/parent-delete-expected.txt (0 => 171347)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/accessibility/parent-delete-expected.txt         (rev 0)
+++ trunk/LayoutTests/accessibility/parent-delete-expected.txt        2014-07-22 17:50:31 UTC (rev 171347)
</span><span class="lines">@@ -0,0 +1,31 @@
</span><ins>+This test passes if there is no crash.
+AXRole: AXWebArea
+AXRoleDescription: HTML content
+AXChildren: <array of size 1>
+AXHelp:
+AXParent: <AXWebArea>
+AXSize: NSSize: {800, 600}
+AXTitle:
+AXDescription:
+AXValue:
+AXFocused: 0
+AXEnabled: 1
+AXWindow: <AXWebArea>
+AXSelectedTextMarkerRange: (null)
+AXStartTextMarker: <AXWebArea>
+AXEndTextMarker: <AXWebArea>
+AXVisited: 0
+AXLinkedUIElements: (null)
+AXSelected: 0
+AXBlockQuoteLevel: 0
+AXTopLevelUIElement: <AXWebArea>
+AXLanguage:
+AXDOMIdentifier:
+AXDOMClassList: <array of size 0>
+AXLinkUIElements: <array of size 0>
+AXLoaded: 1
+AXLayoutCount: 2
+AXLoadingProgress: 1
+AXURL: LayoutTests/accessibility/parent-delete.html
+AXElementBusy: 0
+
</ins></span></pre></div>
<a id="trunkLayoutTestsaccessibilityparentdeletehtml"></a>
<div class="addfile"><h4>Added: trunk/LayoutTests/accessibility/parent-delete.html (0 => 171347)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/accessibility/parent-delete.html         (rev 0)
+++ trunk/LayoutTests/accessibility/parent-delete.html        2014-07-22 17:50:31 UTC (rev 171347)
</span><span class="lines">@@ -0,0 +1,39 @@
</span><ins>+<!DOCTYPE html>
+<html>
+<head>
+<script>
+if (window.testRunner)
+ testRunner.dumpAsText();
+
+function runTest() {
+ var accessibilityElement;
+ {
+ var outer = document.getElementById("outer");
+ var inner = document.getElementById("inner");
+ var editable = document.getElementById("editable");
+ var result = document.getElementById("result");
+ editable.focus();
+ if (window.accessibilityController) {
+ var accessibilityElement = accessibilityController.focusedElement;
+ }
+ inner.removeChild(editable);
+ outer.removeChild(inner);
+ }
+ if (window.accessibilityController) {
+ result.innerText = accessibilityElement.allAttributes();
+ }
+}
+</script>
+</head>
+<body onload="runTest()">
+This test passes if there is no crash.
+<div id="outer" style="display: none;">
+ <div id="inner" style="display: none;">
+ <div id="editable" contenteditable="true" style="display: none;">
+ This is some throwaway text
+ </div>
+ </div>
+</div>
+<div id="result"></div>
+</body>
+</html>
</ins></span></pre></div>
<a id="trunkSourceWebCoreChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/ChangeLog (171346 => 171347)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/ChangeLog        2014-07-22 17:32:38 UTC (rev 171346)
+++ trunk/Source/WebCore/ChangeLog        2014-07-22 17:50:31 UTC (rev 171347)
</span><span class="lines">@@ -1,3 +1,22 @@
</span><ins>+2014-07-21 Myles C. Maxfield <mmaxfield@apple.com>
+
+ Clicking on links while accessibility is enabled sometimes crashes
+ https://bugs.webkit.org/show_bug.cgi?id=135074
+
+ Reviewed by Chris Fleizach.
+
+ When an accessibility request comes in from the system, we call updateBackingStore() on the
+ relevant AccessibilityObject, which triggers a relayout of the entire document. This relayout
+ might delete that accessibility node and its parent, which would cause the node to be deleted.
+ After the stack unwinds, we then call a member function on the node without checking for this
+ condition.
+
+ Test: accessibility/parent-delete.html
+
+ * accessibility/AccessibilityObject.cpp:
+ (WebCore::AccessibilityObject::updateBackingStore): Retain the node for the duration of the
+ function.
+
</ins><span class="cx"> 2014-07-22 Jeremy Jones <jeremyj@apple.com>
</span><span class="cx">
</span><span class="cx"> Don't create new UIWindow for video fullscreen.
</span></span></pre></div>
<a id="trunkSourceWebCoreaccessibilityAccessibilityObjectcpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/accessibility/AccessibilityObject.cpp (171346 => 171347)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/accessibility/AccessibilityObject.cpp        2014-07-22 17:32:38 UTC (rev 171346)
+++ trunk/Source/WebCore/accessibility/AccessibilityObject.cpp        2014-07-22 17:50:31 UTC (rev 171347)
</span><span class="lines">@@ -1429,6 +1429,8 @@
</span><span class="cx"> void AccessibilityObject::updateBackingStore()
</span><span class="cx"> {
</span><span class="cx"> // Updating the layout may delete this object.
</span><ins>+ RefPtr<AccessibilityObject> protector(this);
+
</ins><span class="cx"> if (Document* document = this->document()) {
</span><span class="cx"> if (!document->view()->isInLayout())
</span><span class="cx"> document->updateLayoutIgnorePendingStylesheets();
</span></span></pre>
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