[Webkit-unassigned] [Bug 253165] New: Make sure child is a RenderElement before trying to pass it into shouldChildInlineMarginContributeToContainerIntrinsicSize in RenderBlock::computeBlockPreferredLogicalWidths

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=253165

            Bug ID: 253165
           Summary: Make sure child is a RenderElement before trying to
                    pass it into
                    shouldChildInlineMarginContributeToContainerIntrinsicS
                    ize in RenderBlock::computeBlockPreferredLogicalWidths
           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: sgill26 at apple.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

The assumption about this code currently is that child cannot be a RenderText within RenderBlock::computeBlockPreferredLogicalWidths. That assumption is wrong and can lead to a nullptr dereference. We should check the result of the cast before trying to pass it in

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