[Webkit-unassigned] [Bug 169620] New: Add a null check in VMTraps::willDestroyVM() to handle a race condition.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=169620

            Bug ID: 169620
           Summary: Add a null check in VMTraps::willDestroyVM() to handle
                    a race condition.
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mark.lam at apple.com

There exists a race between VMTraps::willDestroyVM() (which removed SignalSenders from its m_signalSenders list) and SignalSender::send() (which removes itself from the list).  In the event that SignalSender::send() removes itself between the time that VMTraps::willDestroyVM() checks if m_signalSenders is empty and the time it takes a sender from m_signalSenders, VMTraps::willDestroyVM() may end up with a NULL sender pointer.  The fix is add the missing null check before using the sender pointer.

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