Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: ebefa2a06e1b9d78db15d77f6054cbc5d8ba85b2
https://github.com/WebKit/WebKit/commit/ebefa2a06e1b9d78db15d77f6054cbc5d8ba85b2
Author: Tyler Wilcock <[email protected]>
Date: 2026-02-27 (Fri, 27 Feb 2026)
Changed paths:
M Source/WebCore/accessibility/AXCoreObject.cpp
Log Message:
-----------
AX: AXCoreObject::partialOrder can loop infinitely for cross-frame objects
with ENABLE(ACCESSIBILITY_LOCAL_FRAME)
https://bugs.webkit.org/show_bug.cgi?id=308823
rdar://171359781
Reviewed by Joshua Hoffman.
With ENABLE(ACCESSIBILITY_LOCAL_FRAME), each frame has its own accessibility
tree root,
so parentObject() returns nullptr at frame boundaries. In partialOrder(), when
this happened,
current/otherCurrent were never set to nullptr, causing an infinite loop that
hit the
failsafe assertion. Fix by nulling out current/otherCurrent when parentObject()
returns
nullptr. Also tighten the post-loop assertion to only fire when objects are in
the same
tree (where a shared ancestor should always exist), since cross-frame objects
legitimately
may not share one.
Fixes accessibility/mac/ordered-textmarker-crash.html with
ENABLE(ACCESSIBILITY_LOCAL_FRAME).
* Source/WebCore/accessibility/AXCoreObject.cpp:
(WebCore::AXCoreObject::partialOrder):
Canonical link: https://commits.webkit.org/308374@main
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