[Webkit-unassigned] [Bug 167036] New: Correct potential nullptr dereference in RenderLayer::updateLayerPosition()

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=167036

            Bug ID: 167036
           Summary: Correct potential nullptr dereference in
                    RenderLayer::updateLayerPosition()
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: bfulgham at webkit.org
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Crash logs indicate an infrequent crash in RenderLayer::updateLayerPosition().

Code inspection reveals that we might dereference a nullptr for elements with enclosing parents with a layer. The search for this parent might end without finding anything, resulting in the ancestor being set to nullptr.

This patch adds the missing nullptr check to avoid this possibility.

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