[Webkit-unassigned] [Bug 55359] New: WebCore::Editor::selectionStartCSSPropertyValue crashes is no font size is supplied

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=55359

           Summary: WebCore::Editor::selectionStartCSSPropertyValue
                    crashes is no font size is supplied
           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=84034)
 --> (https://bugs.webkit.org/attachment.cgi?id=84034&action=review)
Repro

Chromium: http://code.google.com/p/chromium/issues/detail?id=74392
Variation of: bug 45068

Repro:
<script>document.queryCommandValue("FontSize")</script>

id:             chrome.dll!WebCore::Editor::selectionStartCSSPropertyValue ReadAV at NULL (07e9b856f4be9e9f44daffbf76cc4066)
description:    Attempt to read from unallocated NULL pointer+0x4 in chrome.dll!WebCore::Editor::selectionStartCSSPropertyValue
stack:          chrome.dll!WebCore::Editor::selectionStartCSSPropertyValue
                chrome.dll!WebCore::valueFontSize
                chrome.dll!WebCore::Editor::Command::value
                chrome.dll!WebCore::Document::queryCommandValue
                chrome.dll!WebCore::DocumentInternal::queryCommandValueCallback
                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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