[Webkit-unassigned] [Bug 156987] AX: Crash at -[WebAccessibilityObjectWrapper accessibilityAttributeValue:] + 4391

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=156987

--- Comment #2 from chris fleizach <cfleizach at apple.com> ---
Comment on attachment 277266
  --> https://bugs.webkit.org/attachment.cgi?id=277266
Initial patch

View in context: https://bugs.webkit.org/attachment.cgi?id=277266&action=review

> Source/WebCore/accessibility/mac/WebAccessibilityObjectWrapperMac.mm:2751
> +            return !m_object->parentObject() ? nullptr : [NSNumber numberWithFloat:m_object->parentObject()->valueForRange()];

can we instead check earlier than this if the object is detachedFromParent() 
then that will take care of this and other cases

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