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<dl class="meta">
<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/168621">168621</a></dd>
<dt>Author</dt> <dd>stavila@adobe.com</dd>
<dt>Date</dt> <dd>2014-05-12 08:23:34 -0700 (Mon, 12 May 2014)</dd>
</dl>

<h3>Log Message</h3>
<pre>Invalid information remaining in lineToRegion map of RenderFlowThread.
https://bugs.webkit.org/show_bug.cgi?id=132690

Reviewed by Antti Koivisto.

Source/WebCore:
Test: fast/multicol/newmulticol/lines-region-map-crash.html

* rendering/RenderFlowThread.cpp:
(WebCore::RenderFlowThread::deleteLines):
* rendering/RenderFlowThread.h:

LayoutTests:
Added test for crash caused by invalid information in the lineToRegion map.

* fast/multicol/newmulticol/lines-region-map-crash-expected.html: Added.
* fast/multicol/newmulticol/lines-region-map-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="#trunkSourceWebCorerenderingRenderFlowThreadcpp">trunk/Source/WebCore/rendering/RenderFlowThread.cpp</a></li>
<li><a href="#trunkSourceWebCorerenderingRenderFlowThreadh">trunk/Source/WebCore/rendering/RenderFlowThread.h</a></li>
</ul>

<h3>Added Paths</h3>
<ul>
<li><a href="#trunkLayoutTestsfastmulticolnewmulticollinesregionmapcrashexpectedhtml">trunk/LayoutTests/fast/multicol/newmulticol/lines-region-map-crash-expected.html</a></li>
<li><a href="#trunkLayoutTestsfastmulticolnewmulticollinesregionmapcrashhtml">trunk/LayoutTests/fast/multicol/newmulticol/lines-region-map-crash.html</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkLayoutTestsChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/LayoutTests/ChangeLog (168620 => 168621)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/ChangeLog        2014-05-12 14:30:51 UTC (rev 168620)
+++ trunk/LayoutTests/ChangeLog        2014-05-12 15:23:34 UTC (rev 168621)
</span><span class="lines">@@ -1,3 +1,15 @@
</span><ins>+2014-05-12  Radu Stavila  &lt;stavila@adobe.com&gt;
+
+        Invalid information remaining in lineToRegion map of RenderFlowThread.
+        https://bugs.webkit.org/show_bug.cgi?id=132690
+
+        Reviewed by Antti Koivisto.
+
+        Added test for crash caused by invalid information in the lineToRegion map.
+
+        * fast/multicol/newmulticol/lines-region-map-crash-expected.html: Added.
+        * fast/multicol/newmulticol/lines-region-map-crash.html: Added.
+
</ins><span class="cx"> 2014-05-12  Ion Rosca  &lt;rosca@adobe.com&gt;
</span><span class="cx"> 
</span><span class="cx">         [CSS Blending] Adjust blending pixel test expectations
</span></span></pre></div>
<a id="trunkLayoutTestsfastmulticolnewmulticollinesregionmapcrashexpectedhtml"></a>
<div class="addfile"><h4>Added: trunk/LayoutTests/fast/multicol/newmulticol/lines-region-map-crash-expected.html (0 => 168621)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/fast/multicol/newmulticol/lines-region-map-crash-expected.html                                (rev 0)
+++ trunk/LayoutTests/fast/multicol/newmulticol/lines-region-map-crash-expected.html        2014-05-12 15:23:34 UTC (rev 168621)
</span><span class="lines">@@ -0,0 +1,3 @@
</span><ins>+&lt;body&gt;
+        &lt;a href=&quot;https://bugs.webkit.org/show_bug.cgi?id=132690&quot;&gt;Bug 132690 - This test passes if it doesn't crash&lt;/a&gt;
+&lt;/body&gt;
</ins><span class="cx">\ No newline at end of file
</span></span></pre></div>
<a id="trunkLayoutTestsfastmulticolnewmulticollinesregionmapcrashhtml"></a>
<div class="addfile"><h4>Added: trunk/LayoutTests/fast/multicol/newmulticol/lines-region-map-crash.html (0 => 168621)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/fast/multicol/newmulticol/lines-region-map-crash.html                                (rev 0)
+++ trunk/LayoutTests/fast/multicol/newmulticol/lines-region-map-crash.html        2014-05-12 15:23:34 UTC (rev 168621)
</span><span class="lines">@@ -0,0 +1,22 @@
</span><ins>+&lt;body&gt;
+        &lt;span id=&quot;test&quot;&gt;XXXXXXXXXXXXX&lt;/span&gt;
+&lt;/body&gt;
+
+&lt;script&gt;
+        var head = document.getElementsByTagName(&quot;head&quot;)[0];
+        style = document.createElement(&quot;style&quot;);
+        var rule = document.createTextNode(&quot;* {overflow-y:-webkit-paged-x;}&quot;);
+        style.appendChild(rule);
+        head.appendChild(style);
+        document.execCommand(&quot;SelectAll&quot;);
+        style.innerHTML=&quot;* { position: absolute;&quot;;
+        var elem = document.getElementById(&quot;test&quot;);
+        elem.parentNode.removeChild(elem);
+
+        var a = document.createElement('a');
+        var txt = document.createTextNode(&quot;Bug 132690 - This test passes if it doesn't crash&quot;);
+        a.appendChild(txt);
+        a.href = &quot;https://bugs.webkit.org/show_bug.cgi?id=132690&quot;;
+        a.style.width = &quot;600px&quot;;
+        document.body.appendChild(a);
+&lt;/script&gt;
</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 (168620 => 168621)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/ChangeLog        2014-05-12 14:30:51 UTC (rev 168620)
+++ trunk/Source/WebCore/ChangeLog        2014-05-12 15:23:34 UTC (rev 168621)
</span><span class="lines">@@ -1,3 +1,16 @@
</span><ins>+2014-05-12  Radu Stavila  &lt;stavila@adobe.com&gt;
+
+        Invalid information remaining in lineToRegion map of RenderFlowThread.
+        https://bugs.webkit.org/show_bug.cgi?id=132690
+
+        Reviewed by Antti Koivisto.
+
+        Test: fast/multicol/newmulticol/lines-region-map-crash.html
+
+        * rendering/RenderFlowThread.cpp:
+        (WebCore::RenderFlowThread::deleteLines):
+        * rendering/RenderFlowThread.h:
+
</ins><span class="cx"> 2014-05-12  Zan Dobersek  &lt;zdobersek@igalia.com&gt;
</span><span class="cx"> 
</span><span class="cx">         Clean up MainThreadTask
</span></span></pre></div>
<a id="trunkSourceWebCorerenderingRenderFlowThreadcpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/rendering/RenderFlowThread.cpp (168620 => 168621)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/rendering/RenderFlowThread.cpp        2014-05-12 14:30:51 UTC (rev 168620)
+++ trunk/Source/WebCore/rendering/RenderFlowThread.cpp        2014-05-12 15:23:34 UTC (rev 168621)
</span><span class="lines">@@ -953,6 +953,14 @@
</span><span class="cx"> }
</span><span class="cx"> #endif
</span><span class="cx"> 
</span><ins>+void RenderFlowThread::deleteLines()
+{
+    if (m_lineToRegionMap)
+        m_lineToRegionMap-&gt;clear();
+
+    RenderBlockFlow::deleteLines();
+}
+
</ins><span class="cx"> // During the measure content layout phase of the named flow the regions are initialized with a height equal to their max-height.
</span><span class="cx"> // This way unforced breaks are automatically placed when a region is full and the content height/position correctly estimated.
</span><span class="cx"> // Also, the region where a forced break falls is exactly the region found at the forced break offset inside the flow content.
</span></span></pre></div>
<a id="trunkSourceWebCorerenderingRenderFlowThreadh"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/rendering/RenderFlowThread.h (168620 => 168621)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/rendering/RenderFlowThread.h        2014-05-12 14:30:51 UTC (rev 168620)
+++ trunk/Source/WebCore/rendering/RenderFlowThread.h        2014-05-12 15:23:34 UTC (rev 168621)
</span><span class="lines">@@ -71,6 +71,8 @@
</span><span class="cx"> #if !ASSERT_WITH_SECURITY_IMPLICATION_DISABLED
</span><span class="cx">     bool checkLinesConsistency(const RenderBlockFlow*) const;
</span><span class="cx"> #endif
</span><ins>+    
+    virtual void deleteLines() override;
</ins><span class="cx"> 
</span><span class="cx">     virtual void addRegionToThread(RenderRegion*) = 0;
</span><span class="cx">     virtual void removeRegionFromThread(RenderRegion*);
</span></span></pre>
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