<?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>45621</bug_id>
          
          <creation_ts>2010-09-12 14:30:02 -0700</creation_ts>
          <short_desc>isParsingFragment assert hit in new treebuilder</short_desc>
          <delta_ts>2010-09-12 17:43:15 -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>DOM</component>
          <version>528+ (Nightly build)</version>
          <rep_platform>All</rep_platform>
          <op_sys>All</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="Abhishek Arya">inferno</reporter>
          <assigned_to name="Nobody">webkit-unassigned</assigned_to>
          <cc>abarth</cc>
    
    <cc>commit-queue</cc>
    
    <cc>eric</cc>
          

      

      

      

          <comment_sort_order>oldest_to_newest</comment_sort_order>  
          <long_desc isprivate="0" >
    <commentid>277902</commentid>
    <comment_count>0</comment_count>
      <attachid>67345</attachid>
    <who name="Abhishek Arya">inferno</who>
    <bug_when>2010-09-12 14:30:02 -0700</bug_when>
    <thetext>Created attachment 67345
Testcase

found in my layouttest fuzzing. Also credit to Cris Neckar, from whose html fuzzer i took some ideas from. This is the second most hit assert,crash in my fuzzing after bug 45570.

Reduced Testcase:
&lt;kbd&gt;&lt;table&gt;&lt;/kbd&gt;&lt;col&gt;&lt;select&gt;&lt;tr&gt;

In HTMLTreeBuilder::resetInsertionModeAppropriately(), this assert is hit first. Then we pick up m_fragmentContext.contextElement() which comes out as null, which causes node to be null and crashes in the if statement. I am not sure if this can trigger memory corruption. So filed with security tags.

            ASSERT(isParsingFragment());
            last = true;
            node = m_fragmentContext.contextElement();
        }
        if (node-&gt;hasTagName(selectTag)) {

Eric, Adam, if you think it cannot have security consequences, please feel free to remove the tags.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>277911</commentid>
    <comment_count>1</comment_count>
    <who name="Adam Barth">abarth</who>
    <bug_when>2010-09-12 16:25:44 -0700</bug_when>
    <thetext>This is a bug in the spec:

http://www.w3.org/Bugs/Public/show_bug.cgi?id=10617</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>277912</commentid>
    <comment_count>2</comment_count>
      <attachid>67346</attachid>
    <who name="Adam Barth">abarth</who>
    <bug_when>2010-09-12 16:27:16 -0700</bug_when>
    <thetext>Created attachment 67346
test cases</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>277917</commentid>
    <comment_count>3</comment_count>
      <attachid>67348</attachid>
    <who name="Adam Barth">abarth</who>
    <bug_when>2010-09-12 16:47:53 -0700</bug_when>
    <thetext>Created attachment 67348
Patch</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>277918</commentid>
    <comment_count>4</comment_count>
      <attachid>67349</attachid>
    <who name="Adam Barth">abarth</who>
    <bug_when>2010-09-12 16:50:56 -0700</bug_when>
    <thetext>Created attachment 67349
Patch</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>277920</commentid>
    <comment_count>5</comment_count>
      <attachid>67349</attachid>
    <who name="Eric Seidel (no email)">eric</who>
    <bug_when>2010-09-12 16:56:19 -0700</bug_when>
    <thetext>Comment on attachment 67349
Patch

LGTM.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>277922</commentid>
    <comment_count>6</comment_count>
    <who name="Eric Seidel (no email)">eric</who>
    <bug_when>2010-09-12 16:56:33 -0700</bug_when>
    <thetext>I don&apos;t believe this is security sensitive and can be unmarked as such.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>277934</commentid>
    <comment_count>7</comment_count>
      <attachid>67349</attachid>
    <who name="WebKit Commit Bot">commit-queue</who>
    <bug_when>2010-09-12 17:43:10 -0700</bug_when>
    <thetext>Comment on attachment 67349
Patch

Clearing flags on attachment: 67349

Committed r67356: &lt;http://trac.webkit.org/changeset/67356&gt;</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>277935</commentid>
    <comment_count>8</comment_count>
    <who name="WebKit Commit Bot">commit-queue</who>
    <bug_when>2010-09-12 17:43:15 -0700</bug_when>
    <thetext>All reviewed patches have been landed.  Closing bug.</thetext>
  </long_desc>
      
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            <attachid>67345</attachid>
            <date>2010-09-12 14:30:02 -0700</date>
            <delta_ts>2010-09-12 14:30:02 -0700</delta_ts>
            <desc>Testcase</desc>
            <filename>test1284153506.89test.html</filename>
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            <size>35</size>
            <attacher name="Abhishek Arya">inferno</attacher>
            
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            <delta_ts>2010-09-12 16:47:49 -0700</delta_ts>
            <desc>test cases</desc>
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            <date>2010-09-12 16:47:53 -0700</date>
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          </attachment>
          <attachment
              isobsolete="0"
              ispatch="1"
              isprivate="0"
          >
            <attachid>67349</attachid>
            <date>2010-09-12 16:50:56 -0700</date>
            <delta_ts>2010-09-12 17:43:10 -0700</delta_ts>
            <desc>Patch</desc>
            <filename>bug-45621-20100912165055.patch</filename>
            <type>text/plain</type>
            <size>5177</size>
            <attacher name="Adam Barth">abarth</attacher>
            
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          </attachment>
      

    </bug>

</bugzilla>