[Webkit-unassigned] [Bug 43140] New: MessageChannel doesn't like navigating it's window

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=43140

           Summary: MessageChannel doesn't like navigating it's window
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Windows Vista
            Status: NEW
          Severity: Normal
          Priority: P1
         Component: HTML DOM
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: skylined at chromium.org
                CC: eric at webkit.org
            Blocks: 42959


Repro:
<script>
  targetWindow = window.open("");
  channel = new targetWindow.MessageChannel(new Array);
  targetWindow.location.href='data:text/html;';
  setTimeout(function () {
    channel.port2.start();
  }, 100);
</script>
It appears the MessageChannel doesn't like it if you navigate the window it comes from and then try to access it. This is probably just a NULL pointer crash, but I have seen similar bugs that were use-after-free, so marking as security just in case.

id:             WebCore::ScriptExecutionContext::processMessagePortMessagesSoon ReadAV at NULL (67f8138865f436968bd4e2c306c9ea48)
description:    Attempt to read from NULL pointer in WebCore::ScriptExecutionContext::processMessagePortMessagesSoon
stack:          WebCore::ScriptExecutionContext::processMessagePortMessagesSoon
                v8::internal::HandleApiCallHelper<...>
                v8::internal::Builtin_HandleApiCall
                v8::internal::Invoke
                v8::internal::Execution::Call
                ...

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