[Webkit-unassigned] [Bug 56004] New: chrome.dll!WebCore::lastPositionInNode ReadAV at NULL (23c8d35ca79c9994c6691ce3fa381d59)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=56004

           Summary: chrome.dll!WebCore::lastPositionInNode ReadAV at NULL
                    (23c8d35ca79c9994c6691ce3fa381d59)
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Windows Vista
            Status: NEW
          Severity: Normal
          Priority: P1
         Component: HTML Editing
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: skylined at chromium.org
                CC: rniwa at webkit.org


Created an attachment (id=85149)
 --> (https://bugs.webkit.org/attachment.cgi?id=85149&action=review)
Repro

Chromium: 
http://code.google.com/p/chromium/issues/detail?id=75410

Repro:
<script>
  setTimeout(function() {
    document.open();
    _Selection_4 = getSelection();
    _Selection_4.setPosition(document,0);
    _Selection_4.modify("extend","forward","line"); // line, paragraph
  }, 1);
</script>

id:             chrome.dll!WebCore::lastPositionInNode ReadAV at NULL (23c8d35ca79c9994c6691ce3fa381d59)
description:    Attempt to read from unallocated NULL pointer in chrome.dll!WebCore::lastPositionInNode
application:    Chromium 11.0.696.0
stack:          chrome.dll!WebCore::lastPositionInNode
                chrome.dll!WebCore::nextLinePosition
                chrome.dll!WebCore::nextParagraphPosition
                chrome.dll!WebCore::SelectionController::modifyExtendingForward
                chrome.dll!WebCore::SelectionController::modify
                chrome.dll!WebCore::DOMSelection::modify
                chrome.dll!WebCore::DOMSelectionInternal::modifyCallback
                chrome.dll!v8::internal::HandleApiCallHelper<...>
                chrome.dll!v8::internal::Builtin_HandleApiCall
                chrome.dll!v8::internal::Invoke
                chrome.dll!v8::internal::Execution::Call
                ...

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