From: Carlos Garcia Campos <carlosgc@webkit.org>
Subject: Fix segfault when calling clearSelection on a detached RenderObject
Bug: https://bugs.webkit.org/show_bug.cgi?id=140275
Origin: http://trac.webkit.org/changeset/178360
Index: webkitgtk/Source/WebCore/rendering/RenderBox.cpp
===================================================================
--- webkitgtk.orig/Source/WebCore/rendering/RenderBox.cpp
+++ webkitgtk/Source/WebCore/rendering/RenderBox.cpp
@@ -1828,6 +1828,8 @@ LayoutUnit RenderBox::containingBlockLog
 #endif
 
     RenderBlock* cb = containingBlock();
+    if (!cb)
+        return LayoutUnit();
     return cb->availableLogicalWidth();
 }
 
@@ -1839,6 +1841,8 @@ LayoutUnit RenderBox::containingBlockLog
 #endif
 
     RenderBlock* cb = containingBlock();
+    if (!cb)
+        return LayoutUnit();
     return cb->availableLogicalHeight(heightType);
 }
 
Index: webkitgtk/Source/WebCore/rendering/RenderView.cpp
===================================================================
--- webkitgtk.orig/Source/WebCore/rendering/RenderView.cpp
+++ webkitgtk/Source/WebCore/rendering/RenderView.cpp
@@ -1105,7 +1105,7 @@ void RenderView::getSelection(RenderObje
 void RenderView::clearSelection()
 {
     layer()->repaintBlockSelectionGaps();
-    setSelection(0, -1, 0, -1, RepaintNewMinusOld);
+    setSelection(nullptr, -1, nullptr, -1, RepaintNewMinusOld);
 }
 
 bool RenderView::printing() const