[Webkit-unassigned] [Bug 205132] Null Ptr Deref @ WTF::TypeCastTraits<WebCore::HTMLTextFormControlElement const, WebCore::Element const, false>::isType

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=205132

--- Comment #7 from Ryosuke Niwa <rniwa at webkit.org> ---
(In reply to Jack from comment #6)
> (In reply to Ryosuke Niwa from comment #5)
> > > Source/WebCore/html/shadow/TextControlInnerElements.cpp:176
> > > +    if (shadowHost() && shadowHostStyle) {
> > 
> > This isn't right. We shouldn't have nullptr for shadowHostStyle here. We
> > need to figure out how we're getting there.
> 
> I did check the flag when this element was created. When instantiating
> TextControlInnerTextElement, the argument "document" passed to the
> constructor has IsShadowRootFlag set to false, and the element simply copy
> that flag.

?? Document is never a shadow root.

TextControlInnerElements exists inside the shadow tree of a HTMLInputElement / HTMLTextAreaElement. The shadow host of such a shadow tree is HTMLInputElement / HTMLTextAreaElement. See https://developer.mozilla.org/en-US/docs/Web/Web_Components/Using_shadow_DOM

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