[Webkit-unassigned] [Bug 193027] New: null pointer crash in webcore::CompositeEditCommand::moveParagraphs

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=193027

            Bug ID: 193027
           Summary: null pointer crash in
                    webcore::CompositeEditCommand::moveParagraphs
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: PC
                OS: macOS 10.13
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: hellowuzekai at gmail.com

Created attachment 358052

  --> https://bugs.webkit.org/attachment.cgi?id=358052&action=review

a html file to trigger this bug

In webcore::CompositeEditCommand::moveParagraphs function

auto editableRoot = destination.rootEditableElement();
...
Element* rootEditableElement() const { return m_deepPosition.isNotNull() ? m_deepPosition.deprecatedNode()->rootEditableElement() : 0; }

It set the editableRoot to null.

And then

RefPtr<Range> startToDestinationRange(Range::create(document(), firstPositionInNode(editableRoot), destination.deepEquivalent().parentAnchoredEquivalent()));

firstPositionInNode(editableRoot) will trigger a null pointer crash.

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