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<dl class="meta">
<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/195468">195468</a></dd>
<dt>Author</dt> <dd>n_wang@apple.com</dd>
<dt>Date</dt> <dd>2016-01-22 12:53:31 -0800 (Fri, 22 Jan 2016)</dd>
</dl>
<h3>Log Message</h3>
<pre>AX: Crash in setTextMarkerDataWithCharacterOffset
https://bugs.webkit.org/show_bug.cgi?id=153365
<rdar://problem/24287924>
Reviewed by Chris Fleizach.
Source/WebCore:
Sometimes when we try to create a text marker range from a stale text marker with a removed
node, it will cause crash. Fixed it by adding a null check for the AccessibilityObject we
create in setTextMarkerDataWithCharacterOffset.
Test: accessibility/text-marker/text-marker-range-with-removed-node-crash.html
* accessibility/AXObjectCache.cpp:
(WebCore::AXObjectCache::setTextMarkerDataWithCharacterOffset):
LayoutTests:
* accessibility/text-marker/text-marker-range-with-removed-node-crash-expected.txt: Added.
* accessibility/text-marker/text-marker-range-with-removed-node-crash.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="#trunkSourceWebCoreaccessibilityAXObjectCachecpp">trunk/Source/WebCore/accessibility/AXObjectCache.cpp</a></li>
</ul>
<h3>Added Paths</h3>
<ul>
<li><a href="#trunkLayoutTestsaccessibilitytextmarkertextmarkerrangewithremovednodecrashexpectedtxt">trunk/LayoutTests/accessibility/text-marker/text-marker-range-with-removed-node-crash-expected.txt</a></li>
<li><a href="#trunkLayoutTestsaccessibilitytextmarkertextmarkerrangewithremovednodecrashhtml">trunk/LayoutTests/accessibility/text-marker/text-marker-range-with-removed-node-crash.html</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkLayoutTestsChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/LayoutTests/ChangeLog (195467 => 195468)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/ChangeLog 2016-01-22 20:37:42 UTC (rev 195467)
+++ trunk/LayoutTests/ChangeLog 2016-01-22 20:53:31 UTC (rev 195468)
</span><span class="lines">@@ -1,3 +1,14 @@
</span><ins>+2016-01-22 Nan Wang <n_wang@apple.com>
+
+ AX: Crash in setTextMarkerDataWithCharacterOffset
+ https://bugs.webkit.org/show_bug.cgi?id=153365
+ <rdar://problem/24287924>
+
+ Reviewed by Chris Fleizach.
+
+ * accessibility/text-marker/text-marker-range-with-removed-node-crash-expected.txt: Added.
+ * accessibility/text-marker/text-marker-range-with-removed-node-crash.html: Added.
+
</ins><span class="cx"> 2016-01-22 Brady Eidson <beidson@apple.com>
</span><span class="cx">
</span><span class="cx"> Modern IDB: Add transactions and create/delete object store to SQLite backend
</span></span></pre></div>
<a id="trunkLayoutTestsaccessibilitytextmarkertextmarkerrangewithremovednodecrashexpectedtxt"></a>
<div class="addfile"><h4>Added: trunk/LayoutTests/accessibility/text-marker/text-marker-range-with-removed-node-crash-expected.txt (0 => 195468)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/accessibility/text-marker/text-marker-range-with-removed-node-crash-expected.txt (rev 0)
+++ trunk/LayoutTests/accessibility/text-marker/text-marker-range-with-removed-node-crash-expected.txt 2016-01-22 20:53:31 UTC (rev 195468)
</span><span class="lines">@@ -0,0 +1,10 @@
</span><ins>+This tests that when we create a text marker range from a marker with removed text node, it won't crash.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+text to be removed
+PASS successfullyParsed is true
+
+TEST COMPLETE
+
</ins></span></pre></div>
<a id="trunkLayoutTestsaccessibilitytextmarkertextmarkerrangewithremovednodecrashhtml"></a>
<div class="addfile"><h4>Added: trunk/LayoutTests/accessibility/text-marker/text-marker-range-with-removed-node-crash.html (0 => 195468)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/accessibility/text-marker/text-marker-range-with-removed-node-crash.html (rev 0)
+++ trunk/LayoutTests/accessibility/text-marker/text-marker-range-with-removed-node-crash.html 2016-01-22 20:53:31 UTC (rev 195468)
</span><span class="lines">@@ -0,0 +1,37 @@
</span><ins>+<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
+<html>
+<head>
+<script src="../../resources/js-test-pre.js"></script>
+</head>
+
+<body id="body">
+
+<div id="toBeRemoved">text to be removed</div>
+
+<p id="description"></p>
+<div id="console"></div>
+
+<script>
+
+ description("This tests that when we create a text marker range from a marker with removed text node, it won't crash.");
+
+ if (window.accessibilityController) {
+
+ var textElement = accessibilityController.accessibleElementById("toBeRemoved");
+ var textMarkerRange = textElement.textMarkerRangeForElement(textElement);
+ debug(textElement.stringForTextMarkerRange(textMarkerRange));
+
+ var startMarker = textElement.startTextMarkerForTextMarkerRange(textMarkerRange);
+ var endMarker = textElement.endTextMarkerForTextMarkerRange(textMarkerRange);
+
+ // Remove the text node and recreate a text marker range, make sure it won't crash.
+ var text = document.getElementById("toBeRemoved");
+ text.removeChild(text.firstChild);
+ textMarkerRange = textElement.textMarkerRangeForMarkers(startMarker, endMarker);
+ }
+
+</script>
+
+<script src="../../resources/js-test-post.js"></script>
+</body>
+</html>
</ins><span class="cx">\ No newline at end of file
</span></span></pre></div>
<a id="trunkSourceWebCoreChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/ChangeLog (195467 => 195468)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/ChangeLog 2016-01-22 20:37:42 UTC (rev 195467)
+++ trunk/Source/WebCore/ChangeLog 2016-01-22 20:53:31 UTC (rev 195468)
</span><span class="lines">@@ -1,3 +1,20 @@
</span><ins>+2016-01-22 Nan Wang <n_wang@apple.com>
+
+ AX: Crash in setTextMarkerDataWithCharacterOffset
+ https://bugs.webkit.org/show_bug.cgi?id=153365
+ <rdar://problem/24287924>
+
+ Reviewed by Chris Fleizach.
+
+ Sometimes when we try to create a text marker range from a stale text marker with a removed
+ node, it will cause crash. Fixed it by adding a null check for the AccessibilityObject we
+ create in setTextMarkerDataWithCharacterOffset.
+
+ Test: accessibility/text-marker/text-marker-range-with-removed-node-crash.html
+
+ * accessibility/AXObjectCache.cpp:
+ (WebCore::AXObjectCache::setTextMarkerDataWithCharacterOffset):
+
</ins><span class="cx"> 2016-01-22 Brady Eidson <beidson@apple.com>
</span><span class="cx">
</span><span class="cx"> Modern IDB: Add transactions and create/delete object store to SQLite backend
</span></span></pre></div>
<a id="trunkSourceWebCoreaccessibilityAXObjectCachecpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/accessibility/AXObjectCache.cpp (195467 => 195468)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/accessibility/AXObjectCache.cpp 2016-01-22 20:37:42 UTC (rev 195467)
+++ trunk/Source/WebCore/accessibility/AXObjectCache.cpp 2016-01-22 20:53:31 UTC (rev 195468)
</span><span class="lines">@@ -1616,6 +1616,8 @@
</span><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> RefPtr<AccessibilityObject> obj = this->getOrCreate(domNode);
</span><ins>+ if (!obj)
+ return;
</ins><span class="cx">
</span><span class="cx"> // Convert to visible position.
</span><span class="cx"> VisiblePosition visiblePosition = visiblePositionFromCharacterOffset(obj.get(), characterOffset);
</span></span></pre>
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