[Webkit-unassigned] [Bug 161899] New: Null-pointer dereference in WebCore::MediaPlayer::getStartDate

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=161899

            Bug ID: 161899
           Summary: Null-pointer dereference in
                    WebCore::MediaPlayer::getStartDate
    Classification: Unclassified
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media Elements
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: codecolorist at gmail.com

In webkit/Source/WebCore/html/HTMLMediaElement.cpp, the method HTMLMediaElement::getStartDate doesn't check if m_player is null:

double HTMLMediaElement::getStartDate() const
{
    return m_player->getStartDate().toDouble();
}

So this simple one line javascript can crash the browser:

document.createElement('video').getStartDate()

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