Bug 73273 – Crash caused by V8Proxy::retrieveFrameForCallingContext() returning 0 in V8DOMWindowCustom::handlePostMessageCallback

• Status: RESOLVED
• Resolution: INVALID
• Component: WebCore JavaScript

[Marshall Greenblatt]

1. Create a custom V8 binding that executes another V8 function using the frame context.
2. Call that V8 binding from the body onunload event.

In some cases V8Proxy::retrieveFrameForCallingContext() will return 0 causing the following code in retrieveFrameForCallingContext() to crash:

DOMWindow* source = V8Proxy::retrieveFrameForCallingContext()->domWindow();

The 0 result is caused by the "frame->domWindow() == window" check failing in V8Proxy::retrieveFrame() likely due to the context already being detached from the frame.