[Webkit-unassigned] [Bug 162877] New: Avoid null dereference when changing focus in design mode.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=162877

            Bug ID: 162877
           Summary: Avoid null dereference when changing focus in design
                    mode.
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: bfulgham at webkit.org

A malformed web page consisting of nested iframes can trigger a null dereference when changing focus in design mode. In this scenario, the DOM Window's m_frame member is set to null. This null value is used without checking to refocus the document view on the now non-existant frame.

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