[Webkit-unassigned] [Bug 147052] New: AX: Selection change as a result of focusing an element may cause Safari to crash

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=147052

            Bug ID: 147052
           Summary: AX: Selection change as a result of focusing an
                    element may cause Safari to crash
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Accessibility
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: n_wang at apple.com
                CC: n_wang at apple.com, webkit-bug-importer at group.apple.com

If an accessibilityObject is focused, it calls axObjectCache()->setIsSynchronizingSelection(true) assuming that the focus will cause a selection change. But once the selection is done, there is a chance that axObjectCache() is nullptr and cause axObjectCache()->setIsSynchronizingSelection(false) to crash the browser.

TO REPRO
* Goto Facebook.com
* Click the messanger icon
* Click “see all”
* Enable VoiceOver
* Put the VO cursor in the facebook search field
* PRess VO-Right a lot (or just hold it down)

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