ASSERTION FAILED: y2 >= y1 in WebCore::RenderObject::drawSolidBoxSide

Source/core/rendering/RenderInline.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 1442 matching lines @@
     EBorderStyle outlineStyle = styleToUse->outlineStyle();
 
     bool antialias = shouldAntialiasLines(graphicsContext);
 
     int offset = style()->outlineOffset();
 
     LayoutRect box(LayoutPoint(paintOffset.x() + thisline.x() - offset, paintOffset.y() + thisline.y() - offset),
         LayoutSize(thisline.width() + offset, thisline.height() + offset));
 
     IntRect pixelSnappedBox = pixelSnappedIntRect(box);
+    if (pixelSnappedBox.width() < 0 || pixelSnappedBox.height() < 0)
+        return;
     IntRect pixelSnappedLastLine = pixelSnappedIntRect(paintOffset.x() + lastline.x(), 0, lastline.width(), 0);
     IntRect pixelSnappedNextLine = pixelSnappedIntRect(paintOffset.x() + nextline.x(), 0, nextline.width(), 0);
 
     // left edge
     drawLineForBoxSide(graphicsContext,
         pixelSnappedBox.x() - outlineWidth,
         pixelSnappedBox.y() - (lastline.isEmpty() || thisline.x() < lastline.x() || (lastline.maxX() - 1) <= thisline.x() ? outlineWidth : 0),
         pixelSnappedBox.x(),
         pixelSnappedBox.maxY() + (nextline.isEmpty() || thisline.x() <= nextline.x() || (nextline.maxX() - 1) <= thisline.x() ? outlineWidth : 0),
         BSLeft,
@@ skipping 98 matching lines @@
         container = this;
 
     FloatPoint absPos = container->localToAbsolute();
     region.bounds.setX(absPos.x() + region.bounds.x());
     region.bounds.setY(absPos.y() + region.bounds.y());
 
     regions.append(region);
 }
 
 } // namespace WebCore