[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

zalan <zalan at apple.com> changed:

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--- Comment #17 from zalan <zalan at apple.com> ---
Comment on attachment 246320
  --> https://bugs.webkit.org/attachment.cgi?id=246320
patch

View in context: https://bugs.webkit.org/attachment.cgi?id=246320&action=review

> Source/WebCore/rendering/RenderBlock.cpp:1749
> +    if (!shouldPaintSelectionGaps() || !repaintContainer)

Judging by the stacktrace, I suspect the issue here is that we are in the detached tree state and the renderer (the <textarea> that we try to clear the selection from) has no block ancestor in this detached subtree.
Assume the <textarea> itself is the repaint container (so we have a valid reapintContainer), we'd still crash when we try to dereference its (non-existing) containing block. (see containingBlockForFixedPosition/containingBlockForAbsolutePosition/containingBlockForObjectInFlow)

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