[Webkit-unassigned] [Bug 110631] New: ScrollingStateTree::rootStateNode() should be null-checked since it can be null

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=110631

           Summary: ScrollingStateTree::rootStateNode() should be
                    null-checked since it can be null
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: bdakin at apple.com


ScrollingStateTree::rootStateNode() can be null when you are navigating between pages. There are two places in the code that don't null-check it, and I believe that those spots are responsible for some non-reproducible crashes that we have reports of.

I believe this patch will fix https://bugs.webkit.org/show_bug.cgi?id=110509 which corresponds to <rdar://problem/12519348> and also <rdar://problem/13233090>. The offsets in those crashes do appear to be attempts at accessing setShouldUpdateScrollLayerPositionOnMainThread() and children() respectively on a null ScrollingStateNode.

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