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<dl class="meta">
<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/192947">192947</a></dd>
<dt>Author</dt> <dd>jiewen_tan@apple.com</dd>
<dt>Date</dt> <dd>2015-12-02 11:04:07 -0800 (Wed, 02 Dec 2015)</dd>
</dl>
<h3>Log Message</h3>
<pre>Null dereference loading Blink layout test fast/loader/unload-mutation-crash.html
https://bugs.webkit.org/show_bug.cgi?id=149305
<rdar://problem/22747892>
Reviewed by Brent Fulgham.
Source/WebCore:
Add an extra guard to replaceDocument() against rude JS in unload event handlers.
Test: fast/loader/unload-mutation-crash.html
* loader/DocumentWriter.cpp:
(WebCore::DocumentWriter::replaceDocument):
(WebCore::DocumentWriter::begin):
LayoutTests:
This test case is from Blink <a href="http://trac.webkit.org/projects/webkit/changeset/180918">r180918</a>:
https://codereview.chromium.org/495743003
* fast/loader/unload-mutation-crash-expected.txt: Added.
* fast/loader/unload-mutation-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="#trunkSourceWebCoreloaderDocumentWritercpp">trunk/Source/WebCore/loader/DocumentWriter.cpp</a></li>
</ul>
<h3>Added Paths</h3>
<ul>
<li><a href="#trunkLayoutTestsfastloaderunloadmutationcrashexpectedtxt">trunk/LayoutTests/fast/loader/unload-mutation-crash-expected.txt</a></li>
<li><a href="#trunkLayoutTestsfastloaderunloadmutationcrashhtml">trunk/LayoutTests/fast/loader/unload-mutation-crash.html</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkLayoutTestsChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/LayoutTests/ChangeLog (192946 => 192947)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/ChangeLog        2015-12-02 18:49:09 UTC (rev 192946)
+++ trunk/LayoutTests/ChangeLog        2015-12-02 19:04:07 UTC (rev 192947)
</span><span class="lines">@@ -1,3 +1,17 @@
</span><ins>+2015-12-02 Jiewen Tan <jiewen_tan@apple.com>
+
+ Null dereference loading Blink layout test fast/loader/unload-mutation-crash.html
+ https://bugs.webkit.org/show_bug.cgi?id=149305
+ <rdar://problem/22747892>
+
+ Reviewed by Brent Fulgham.
+
+ This test case is from Blink r180918:
+ https://codereview.chromium.org/495743003
+
+ * fast/loader/unload-mutation-crash-expected.txt: Added.
+ * fast/loader/unload-mutation-crash.html: Added.
+
</ins><span class="cx"> 2015-12-02 Joseph Pecoraro <pecoraro@apple.com>
</span><span class="cx">
</span><span class="cx"> Web Inspector: Handle YieldExpressions in the ScriptSyntaxTree
</span></span></pre></div>
<a id="trunkLayoutTestsfastloaderunloadmutationcrashexpectedtxt"></a>
<div class="addfile"><h4>Added: trunk/LayoutTests/fast/loader/unload-mutation-crash-expected.txt (0 => 192947)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/fast/loader/unload-mutation-crash-expected.txt         (rev 0)
+++ trunk/LayoutTests/fast/loader/unload-mutation-crash-expected.txt        2015-12-02 19:04:07 UTC (rev 192947)
</span><span class="lines">@@ -0,0 +1 @@
</span><ins>+PASS. WebKit didn't crash.
</ins></span></pre></div>
<a id="trunkLayoutTestsfastloaderunloadmutationcrashhtml"></a>
<div class="addfile"><h4>Added: trunk/LayoutTests/fast/loader/unload-mutation-crash.html (0 => 192947)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/fast/loader/unload-mutation-crash.html         (rev 0)
+++ trunk/LayoutTests/fast/loader/unload-mutation-crash.html        2015-12-02 19:04:07 UTC (rev 192947)
</span><span class="lines">@@ -0,0 +1,27 @@
</span><ins>+<!DOCTYPE html>
+<html>
+<head>
+<script>
+if (window.testRunner)
+ window.testRunner.dumpAsText();
+
+function start() {
+ window.firstFrame = document.createElement('iframe');
+ document.body.appendChild(window.firstFrame);
+ window.secondFrame = document.createElement('iframe');
+ window.secondFrame.src = 'javascript:window.top.maybeStart();';
+ window.firstFrame.contentDocument.documentElement.appendChild(window.secondFrame);
+}
+
+function maybeStart() {
+ window.secondFrame.contentWindow.onunload = function() {
+ document.documentElement.removeChild(window.bodyEl);
+ };
+
+ window.firstFrame.src = 'javascript:"";';
+ document.write("PASS. WebKit didn't crash.");
+}
+</script>
+</head>
+<body id=bodyEl onload=start()></body>
+</html>
</ins></span></pre></div>
<a id="trunkSourceWebCoreChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/ChangeLog (192946 => 192947)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/ChangeLog        2015-12-02 18:49:09 UTC (rev 192946)
+++ trunk/Source/WebCore/ChangeLog        2015-12-02 19:04:07 UTC (rev 192947)
</span><span class="lines">@@ -1,3 +1,19 @@
</span><ins>+2015-12-02 Jiewen Tan <jiewen_tan@apple.com>
+
+ Null dereference loading Blink layout test fast/loader/unload-mutation-crash.html
+ https://bugs.webkit.org/show_bug.cgi?id=149305
+ <rdar://problem/22747892>
+
+ Reviewed by Brent Fulgham.
+
+ Add an extra guard to replaceDocument() against rude JS in unload event handlers.
+
+ Test: fast/loader/unload-mutation-crash.html
+
+ * loader/DocumentWriter.cpp:
+ (WebCore::DocumentWriter::replaceDocument):
+ (WebCore::DocumentWriter::begin):
+
</ins><span class="cx"> 2015-12-02 Per Arne Vollan <peavo@outlook.com>
</span><span class="cx">
</span><span class="cx"> [WinCairo] Compile error.
</span></span></pre></div>
<a id="trunkSourceWebCoreloaderDocumentWritercpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/loader/DocumentWriter.cpp (192946 => 192947)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/loader/DocumentWriter.cpp        2015-12-02 18:49:09 UTC (rev 192946)
+++ trunk/Source/WebCore/loader/DocumentWriter.cpp        2015-12-02 19:04:07 UTC (rev 192947)
</span><span class="lines">@@ -73,6 +73,11 @@
</span><span class="cx"> m_frame->loader().stopAllLoaders();
</span><span class="cx"> begin(m_frame->document()->url(), true, ownerDocument);
</span><span class="cx">
</span><ins>+ // begin() might fire an unload event, which will result in a situation where no new document has been attached,
+ // and the old document has been detached. Therefore, bail out if no document is attached.
+ if (!m_frame->document())
+ return;
+
</ins><span class="cx"> if (!source.isNull()) {
</span><span class="cx"> if (!m_hasReceivedSomeData) {
</span><span class="cx"> m_hasReceivedSomeData = true;
</span><span class="lines">@@ -141,6 +146,11 @@
</span><span class="cx"> m_frame->loader().clear(document.ptr(), !shouldReuseDefaultView, !shouldReuseDefaultView);
</span><span class="cx"> clear();
</span><span class="cx">
</span><ins>+ // m_frame->loader().clear() might fire unload event which could remove the view of the document.
+ // Bail out if document has no view.
+ if (!document->view())
+ return;
+
</ins><span class="cx"> if (!shouldReuseDefaultView)
</span><span class="cx"> m_frame->script().updatePlatformScriptObjects();
</span><span class="cx">
</span></span></pre>
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