<?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>224836</bug_id>
          
          <creation_ts>2021-04-20 15:34:06 -0700</creation_ts>
          <short_desc>Crash in StyledMarkupAccumulator::traverseNodesForSerialization()</short_desc>
          <delta_ts>2021-04-21 15:48:47 -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>HTML Editing</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>InRadar</keywords>
          <priority>P2</priority>
          <bug_severity>Normal</bug_severity>
          <target_milestone>---</target_milestone>
          
          
          <everconfirmed>1</everconfirmed>
          <reporter name="Julian Gonzalez">julian_a_gonzalez</reporter>
          <assigned_to name="Nobody">webkit-unassigned</assigned_to>
          <cc>ews-watchlist</cc>
    
    <cc>mifenton</cc>
    
    <cc>rniwa</cc>
    
    <cc>wenson_hsieh</cc>
          

      

      

      

          <comment_sort_order>oldest_to_newest</comment_sort_order>  
          <long_desc isprivate="0" >
    <commentid>1752464</commentid>
    <comment_count>0</comment_count>
    <who name="Julian Gonzalez">julian_a_gonzalez</who>
    <bug_when>2021-04-20 15:34:06 -0700</bug_when>
    <thetext>In Release, I can hit the following crash:

WebCore::StyledMarkupAccumulator::firstChild(WebCore::Node&amp;)
WebCore::StyledMarkupAccumulator::traverseNodesForSerialization(WebCore::Node*, WebCore::Node*, WebCore::StyledMarkupAccumulator::NodeTraversalMode)
WebCore::StyledMarkupAccumulator::serializeNodes(WebCore::Position const&amp;, WebCore::Position const&amp;)
WebCore::serializePreservingVisualAppearanceInternal(WebCore::Position const&amp;, WebCore::Position const&amp;, WTF::Vector&lt;WebCore::Node*, 0ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc&gt;*, WebCore::ResolveURLs, WebCore::SerializeComposedTree, WebCore::AnnotateForInterchange, WebCore::ConvertBlocksToInlines, WebCore::StandardFontFamilySerializationMode, WebCore::MSOListMode)
WebCore::serializePreservingVisualAppearance(WebCore::VisibleSelection const&amp;, WebCore::ResolveURLs, WebCore::SerializeComposedTree, WTF::Vector&lt;WebCore::Node*, 0ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc&gt;*)


in Debug, we hit an assertion first:

ASSERTION FAILED: next || !pastEnd
./editing/markup.cpp : WebCore::Node *WebCore::StyledMarkupAccumulator::traverseNodesForSerialization(WebCore::Node *, WebCore::Node *, WebCore::StyledMarkupAccumulator::NodeTraversalMode)
1   0x3e7ef90d9 WTFCrash
2   0x3b0a5d2e0 PAL::canLoad_libAccessibility__AXSIsolatedTreeMode()
3   0x3b92bc1f0 WebCore::StyledMarkupAccumulator::traverseNodesForSerialization(WebCore::Node*, WebCore::Node*, WebCore::StyledMarkupAccumulator::NodeTraversalMode)
4   0x3b92bb6a0 WebCore::StyledMarkupAccumulator::serializeNodes(WebCore::Position const&amp;, WebCore::Position const&amp;)
5   0x3b92befc5 WebCore::serializePreservingVisualAppearanceInternal(WebCore::Position const&amp;, WebCore::Position const&amp;, WTF::Vector&lt;WebCore::Node*, 0ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc&gt;*, WebCore::ResolveURLs, WebCore::SerializeComposedTree, WebCore::AnnotateForInterchange, WebCore::ConvertBlocksToInlines, WebCore::StandardFontFamilySerializationMode, WebCore::MSOListMode)
6   0x3b92bfa9e WebCore::serializePreservingVisualAppearance(WebCore::VisibleSelection const&amp;, WebCore::ResolveURLs, WebCore::SerializeComposedTree, WTF::Vector&lt;WebCore::Node*, 0ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc&gt;*)
7   0x3ba857c30 WebCore::LegacyWebArchive::createFromSelection(WebCore::Frame*)


&lt;rdar://problem/76328325&gt;</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1752474</commentid>
    <comment_count>1</comment_count>
      <attachid>426604</attachid>
    <who name="Julian Gonzalez">julian_a_gonzalez</who>
    <bug_when>2021-04-20 15:39:38 -0700</bug_when>
    <thetext>Created attachment 426604
Patch</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1752544</commentid>
    <comment_count>2</comment_count>
      <attachid>426604</attachid>
    <who name="Ryosuke Niwa">rniwa</who>
    <bug_when>2021-04-20 17:59:33 -0700</bug_when>
    <thetext>Comment on attachment 426604
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=426604&amp;action=review

&gt; Source/WebCore/editing/markup.cpp:713
&gt; +        bool aboutToGoPastEnd = pastEnd &amp;&amp; isDescendantOf(*pastEnd, *n) &amp;&amp; !next;
&gt; +        if (aboutToGoPastEnd)

This isn&apos;t quite right. When pastEnd &amp;&amp; isDescendantOf(*pastEnd, *n) is true,
we want to set next regardless of whether next is null or not when enterNode returned false.
We currently don&apos;t hit this case because canonicalization of position
will mostly avoid that situation to arise but I don&apos;t think we want to rely on that.

The case we care about is when both of the above conditions were false.
In that case, we&apos;ve entered a node and it has children so we don&apos;t want to skip them here.

So, we probably want to define a new boolean indicating condition like this:

bool didEnterNode = false;
if (!enterNode(*n))
    next = nextSkippingChildren(*n);
else if (!hasChildNodes(*n))
    exitNode(*n);
else
    didEnterNode = true;
bool aboutToGoPastEnd = pastEnd &amp;&amp; (isDescendantOf(*pastEnd, *n) || (!next &amp;&amp; !didEnterNode));</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1752845</commentid>
    <comment_count>3</comment_count>
    <who name="Julian Gonzalez">julian_a_gonzalez</who>
    <bug_when>2021-04-21 11:49:00 -0700</bug_when>
    <thetext>(In reply to Ryosuke Niwa from comment #2)
&gt; Comment on attachment 426604 [details]
&gt; Patch
&gt; 
&gt; View in context:
&gt; https://bugs.webkit.org/attachment.cgi?id=426604&amp;action=review
&gt; 
&gt; &gt; Source/WebCore/editing/markup.cpp:713
&gt; &gt; +        bool aboutToGoPastEnd = pastEnd &amp;&amp; isDescendantOf(*pastEnd, *n) &amp;&amp; !next;
&gt; &gt; +        if (aboutToGoPastEnd)
&gt; 
&gt; This isn&apos;t quite right. When pastEnd &amp;&amp; isDescendantOf(*pastEnd, *n) is true,
&gt; we want to set next regardless of whether next is null or not when enterNode
&gt; returned false.
&gt; We currently don&apos;t hit this case because canonicalization of position
&gt; will mostly avoid that situation to arise but I don&apos;t think we want to rely
&gt; on that.
&gt; 
&gt; The case we care about is when both of the above conditions were false.
&gt; In that case, we&apos;ve entered a node and it has children so we don&apos;t want to
&gt; skip them here.
&gt; 
&gt; So, we probably want to define a new boolean indicating condition like this:
&gt; 
&gt; bool didEnterNode = false;
&gt; if (!enterNode(*n))
&gt;     next = nextSkippingChildren(*n);
&gt; else if (!hasChildNodes(*n))
&gt;     exitNode(*n);
&gt; else
&gt;     didEnterNode = true;
&gt; bool aboutToGoPastEnd = pastEnd &amp;&amp; (isDescendantOf(*pastEnd, *n) || (!next
&gt; &amp;&amp; !didEnterNode));

I don&apos;t think this is quite right either, as this approach breaks several pasteboard tests:

[1286/1900] editing/pasteboard/paste-4039777-fix.html failed unexpectedly (text diff)
[1450/1900] editing/pasteboard/paste-table-001.html failed unexpectedly (text diff)
[1471/1900] editing/pasteboard/paste-text-003.html failed unexpectedly (text diff)
[1599/1900] editing/pasteboard/simplfiying-markup-should-not-strip-content.html failed unexpectedly (text diff)
[1641/1900] editing/pasteboard/testcase-9507.html failed unexpectedly (text diff)

I think this makes sense, considering that we don&apos;t necessarily want to stop if the last node is a descendent of n if it&apos;s later on.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1752859</commentid>
    <comment_count>4</comment_count>
    <who name="Julian Gonzalez">julian_a_gonzalez</who>
    <bug_when>2021-04-21 12:19:37 -0700</bug_when>
    <thetext>(In reply to Julian Gonzalez from comment #3)
&gt; (In reply to Ryosuke Niwa from comment #2)
&gt; &gt; Comment on attachment 426604 [details]
&gt; &gt; Patch
&gt; &gt; 
&gt; &gt; View in context:
&gt; &gt; https://bugs.webkit.org/attachment.cgi?id=426604&amp;action=review
&gt; &gt; 
&gt; &gt; &gt; Source/WebCore/editing/markup.cpp:713
&gt; &gt; &gt; +        bool aboutToGoPastEnd = pastEnd &amp;&amp; isDescendantOf(*pastEnd, *n) &amp;&amp; !next;
&gt; &gt; &gt; +        if (aboutToGoPastEnd)
&gt; &gt; 
&gt; &gt; This isn&apos;t quite right. When pastEnd &amp;&amp; isDescendantOf(*pastEnd, *n) is true,
&gt; &gt; we want to set next regardless of whether next is null or not when enterNode
&gt; &gt; returned false.
&gt; &gt; We currently don&apos;t hit this case because canonicalization of position
&gt; &gt; will mostly avoid that situation to arise but I don&apos;t think we want to rely
&gt; &gt; on that.
&gt; &gt; 
&gt; &gt; The case we care about is when both of the above conditions were false.
&gt; &gt; In that case, we&apos;ve entered a node and it has children so we don&apos;t want to
&gt; &gt; skip them here.
&gt; &gt; 
&gt; &gt; So, we probably want to define a new boolean indicating condition like this:
&gt; &gt; 
&gt; &gt; bool didEnterNode = false;
&gt; &gt; if (!enterNode(*n))
&gt; &gt;     next = nextSkippingChildren(*n);
&gt; &gt; else if (!hasChildNodes(*n))
&gt; &gt;     exitNode(*n);
&gt; &gt; else
&gt; &gt;     didEnterNode = true;
&gt; &gt; bool aboutToGoPastEnd = pastEnd &amp;&amp; (isDescendantOf(*pastEnd, *n) || (!next
&gt; &gt; &amp;&amp; !didEnterNode));
&gt; 
&gt; I don&apos;t think this is quite right either, as this approach breaks several
&gt; pasteboard tests:
&gt; 
&gt; [1286/1900] editing/pasteboard/paste-4039777-fix.html failed unexpectedly
&gt; (text diff)
&gt; [1450/1900] editing/pasteboard/paste-table-001.html failed unexpectedly
&gt; (text diff)
&gt; [1471/1900] editing/pasteboard/paste-text-003.html failed unexpectedly (text
&gt; diff)
&gt; [1599/1900]
&gt; editing/pasteboard/simplfiying-markup-should-not-strip-content.html failed
&gt; unexpectedly (text diff)
&gt; [1641/1900] editing/pasteboard/testcase-9507.html failed unexpectedly (text
&gt; diff)
&gt; 
&gt; I think this makes sense, considering that we don&apos;t necessarily want to stop
&gt; if the last node is a descendent of n if it&apos;s later on.

Looks like

bool aboutToGoPastEnd = pastEnd &amp;&amp; !didEnterNode &amp;&amp; (isDescendantOf(*pastEnd, *n) || !next);

works here.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1752866</commentid>
    <comment_count>5</comment_count>
      <attachid>426728</attachid>
    <who name="Julian Gonzalez">julian_a_gonzalez</who>
    <bug_when>2021-04-21 12:26:47 -0700</bug_when>
    <thetext>Created attachment 426728
Patch</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1752876</commentid>
    <comment_count>6</comment_count>
      <attachid>426728</attachid>
    <who name="Ryosuke Niwa">rniwa</who>
    <bug_when>2021-04-21 12:49:46 -0700</bug_when>
    <thetext>Comment on attachment 426728
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=426728&amp;action=review

&gt; Source/WebCore/editing/markup.cpp:715
&gt; +        bool aboutToGoPastEnd = pastEnd &amp;&amp; !didEnterNode &amp;&amp; (isDescendantOf(*pastEnd, *n) || !next);

Hm... let&apos;s flip the last two expressions and check !next first since that&apos;s faster!</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1752939</commentid>
    <comment_count>7</comment_count>
      <attachid>426748</attachid>
    <who name="Julian Gonzalez">julian_a_gonzalez</who>
    <bug_when>2021-04-21 14:43:02 -0700</bug_when>
    <thetext>Created attachment 426748
Patch</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1752955</commentid>
    <comment_count>8</comment_count>
    <who name="EWS">ews-feeder</who>
    <bug_when>2021-04-21 15:48:46 -0700</bug_when>
    <thetext>Committed r276394 (236869@main): &lt;https://commits.webkit.org/236869@main&gt;

All reviewed patches have been landed. Closing bug and clearing flags on attachment 426748.</thetext>
  </long_desc>
      
          <attachment
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              ispatch="1"
              isprivate="0"
          >
            <attachid>426604</attachid>
            <date>2021-04-20 15:39:38 -0700</date>
            <delta_ts>2021-04-21 12:26:45 -0700</delta_ts>
            <desc>Patch</desc>
            <filename>bug-224836-20210420153937.patch</filename>
            <type>text/plain</type>
            <size>4403</size>
            <attacher name="Julian Gonzalez">julian_a_gonzalez</attacher>
            
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            <delta_ts>2021-04-21 14:43:00 -0700</delta_ts>
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            <type>text/plain</type>
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            <date>2021-04-21 14:43:02 -0700</date>
            <delta_ts>2021-04-21 15:48:46 -0700</delta_ts>
            <desc>Patch</desc>
            <filename>bug-224836-20210421144301.patch</filename>
            <type>text/plain</type>
            <size>4506</size>
            <attacher name="Julian Gonzalez">julian_a_gonzalez</attacher>
            
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</data>

          </attachment>
      

    </bug>

</bugzilla>