[Webkit-unassigned] [Bug 146785] toJSDOMWindow() does not handle objects that descend from the JS DOM Window (crashes on use)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=146785

--- Comment #8 from Mark Lam <mark.lam at apple.com> ---
For the record, here's the crashing stack trace:

(lldb) bt
* thread #1: tid = 0x24d88, 0x0000000115500f80 WebCore`WTF::RefPtr<WebCore::DOMWindow>::operator*(this=0x0000000000000598) const + 16 at RefPtr.h:68, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x598)
    frame #0: 0x0000000115500f80 WebCore`WTF::RefPtr<WebCore::DOMWindow>::operator*(this=0x0000000000000598) const + 16 at RefPtr.h:68
    frame #1: 0x0000000115500f5c WebCore`WebCore::JSDOMWindowBase::impl(this=0x0000000000000000) const + 28 at JSDOMWindowBase.h:48
    frame #2: 0x00000001155005c5 WebCore`WebCore::JSDOMWindow::impl(this=0x0000000000000000) const + 21 at JSDOMWindow.h:93
  * frame #3: 0x00000001157386eb WebCore`WebCore::jsDOMWindowLocation(exec=0x00007fff56cdf820, slotBase=0x000000011c86b100, thisValue=4774284352, (null)=PropertyName at 0x00007fff56cdf598) + 59 at JSDOMWindow.cpp:6078
    frame #4: 0x00000001125e6298 JavaScriptCore`JSC::PropertySlot::getValue(this=0x00007fff56cdf730, exec=0x00007fff56cdf820, propertyName=PropertyName at 0x00007fff56cdf5f0) const + 184 at PropertySlot.h:257
    frame #5: 0x00000001125e607b JavaScriptCore`JSC::JSValue::get(this=0x00007fff56cdf768, exec=0x00007fff56cdf820, propertyName=PropertyName at 0x00007fff56cdf640, slot=0x00007fff56cdf730) const + 91 at JSCJSValueInlines.h:704
    frame #6: 0x0000000112d996a1 JavaScriptCore`::llint_slow_path_get_by_id(exec=0x00007fff56cdf820, pc=0x000000011c9155c0) + 241 at LLIntSlowPaths.cpp:570
    frame #7: 0x0000000112da78d0 JavaScriptCore`llint_entry + 11668

This is attained by simply evaluating the following line in the Inspector console:

    Object.create(window).location

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