<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
<!DOCTYPE bugzilla SYSTEM "https://bugs.webkit.org/page.cgi?id=bugzilla.dtd">

<bugzilla version="5.0.4.1"
          urlbase="https://bugs.webkit.org/"
          
          maintainer="admin@webkit.org"
>

    <bug>
          <bug_id>158879</bug_id>
          
          <creation_ts>2016-06-17 11:15:04 -0700</creation_ts>
          <short_desc>Potential null dereferencing on a detached positioned renderer.</short_desc>
          <delta_ts>2016-06-17 13:21:22 -0700</delta_ts>
          <reporter_accessible>1</reporter_accessible>
          <cclist_accessible>1</cclist_accessible>
          <classification_id>1</classification_id>
          <classification>Unclassified</classification>
          <product>WebKit</product>
          <component>Layout and Rendering</component>
          <version>WebKit Nightly Build</version>
          <rep_platform>Unspecified</rep_platform>
          <op_sys>Unspecified</op_sys>
          <bug_status>RESOLVED</bug_status>
          <resolution>FIXED</resolution>
          
          
          <bug_file_loc></bug_file_loc>
          <status_whiteboard></status_whiteboard>
          <keywords></keywords>
          <priority>P2</priority>
          <bug_severity>Normal</bug_severity>
          <target_milestone>---</target_milestone>
          
          
          <everconfirmed>1</everconfirmed>
          <reporter name="alan">zalan</reporter>
          <assigned_to name="alan">zalan</assigned_to>
          <cc>commit-queue</cc>
    
    <cc>esprehn+autocc</cc>
    
    <cc>glenn</cc>
    
    <cc>kondapallykalyan</cc>
    
    <cc>simon.fraser</cc>
          

      

      

      

          <comment_sort_order>oldest_to_newest</comment_sort_order>  
          <long_desc isprivate="0" >
    <commentid>1203347</commentid>
    <comment_count>0</comment_count>
    <who name="alan">zalan</who>
    <bug_when>2016-06-17 11:15:04 -0700</bug_when>
    <thetext>in RenderBlock::markFixedPositionObjectForLayoutIfNeeded()</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1203385</commentid>
    <comment_count>1</comment_count>
      <attachid>281578</attachid>
    <who name="alan">zalan</who>
    <bug_when>2016-06-17 12:44:00 -0700</bug_when>
    <thetext>Created attachment 281578
Patch</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1203386</commentid>
    <comment_count>2</comment_count>
      <attachid>281578</attachid>
    <who name="Simon Fraser (smfr)">simon.fraser</who>
    <bug_when>2016-06-17 12:47:33 -0700</bug_when>
    <thetext>Comment on attachment 281578
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=281578&amp;action=review

&gt; Source/WebCore/ChangeLog:5
&gt; +        https://bugs.webkit.org/show_bug.cgi?id=158879
&gt; +

Radar?</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1203395</commentid>
    <comment_count>3</comment_count>
      <attachid>281578</attachid>
    <who name="WebKit Commit Bot">commit-queue</who>
    <bug_when>2016-06-17 13:21:18 -0700</bug_when>
    <thetext>Comment on attachment 281578
Patch

Clearing flags on attachment: 281578

Committed r202177: &lt;http://trac.webkit.org/changeset/202177&gt;</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1203396</commentid>
    <comment_count>4</comment_count>
    <who name="WebKit Commit Bot">commit-queue</who>
    <bug_when>2016-06-17 13:21:22 -0700</bug_when>
    <thetext>All reviewed patches have been landed.  Closing bug.</thetext>
  </long_desc>
      
          <attachment
              isobsolete="0"
              ispatch="1"
              isprivate="0"
          >
            <attachid>281578</attachid>
            <date>2016-06-17 12:44:00 -0700</date>
            <delta_ts>2016-06-17 13:21:18 -0700</delta_ts>
            <desc>Patch</desc>
            <filename>bug-158879-20160617124357.patch</filename>
            <type>text/plain</type>
            <size>4350</size>
            <attacher name="alan">zalan</attacher>
            
              <data encoding="base64">U3VidmVyc2lvbiBSZXZpc2lvbjogMjAyMTI1CmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D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</data>

          </attachment>
      

    </bug>

</bugzilla>