[Webkit-unassigned] [Bug 43549] New: cross_fuzz: setTimeout/postMessage NULL pointer

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=43549

           Summary: cross_fuzz: setTimeout/postMessage NULL pointer
           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


Created an attachment (id=63569)
 --> (https://bugs.webkit.org/attachment.cgi?id=63569)
Repro

When using the postMessage functions as an argument to the setTimeout/setInterval functions, it gets called without any arguments or "this" object. This is not handled gracefully and causes a NULL deref and subsequent crash:

<script>
  setTimeout(window.postMessage);
</script>

id:             WebCore::Frame::domWindow ReadAV at NULL (f8cd71f24fff11a7dbb6a39e738fe929)
description:    Attempt to read from NULL pointer (+0x330) in WebCore::Frame::domWindow
stack:          WebCore::Frame::domWindow
                WebCore::V8DOMWindow::postMessageCallback
                v8::internal::HandleApiCallHelper<...>
                v8::internal::Builtin_HandleApiCall
                v8::internal::Invoke
                v8::internal::Execution::Call
                ...

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