diff -up qtwebkit-2.2.2-source/Source/WebCore/platform/graphics/qt/GraphicsContextQt.cpp.svn_infinite_loop qtwebkit-2.2.2-source/Source/WebCore/platform/graphics/qt/GraphicsContextQt.cpp
--- qtwebkit-2.2.2-source/Source/WebCore/platform/graphics/qt/GraphicsContextQt.cpp.svn_infinite_loop	2012-05-22 09:30:37.000000000 -0500
+++ qtwebkit-2.2.2-source/Source/WebCore/platform/graphics/qt/GraphicsContextQt.cpp	2012-11-13 07:21:15.462272336 -0600
@@ -1057,6 +1057,9 @@ void GraphicsContext::setLineDash(const
             count *= 2;
 
         float penWidth = narrowPrecisionToFloat(double(pen.widthF()));
+        if (penWidth <= 0.f)
+            penWidth = 1.f;
+
         for (unsigned i = 0; i < count; i++)
             pattern.append(dashes[i % dashLength] / penWidth);