[Webkit-unassigned] [Bug 140261] Null ptr crash in WebCore::LogicalSelectionOffsetCaches::ContainingBlockInfo::setBlock

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=140261

--- Comment #20 from Ryosuke Niwa <rniwa at webkit.org> ---
Comment on attachment 246514
  --> https://bugs.webkit.org/attachment.cgi?id=246514
patch

View in context: https://bugs.webkit.org/attachment.cgi?id=246514&action=review

> Source/WebCore/rendering/RenderView.cpp:962
> -            && os->selectionState() != SelectionNone) {
> +            && os->selectionState() != SelectionNone && os->containingBlock()) {

It seems a little fragile to check for this condition here.
e.g. RenderView::applySubtreeSelection has a similar check although that one probably won't be called with a null containingBlock.
Perhaps we can extract a helper inline function?

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