Bug 1244918 - avoid using Infs for line start and end when painting g…

…radients. r=mstange
iaxat · Apr 24, 2016 · f35be2e · f35be2e
1 parent 5e045b7
commit f35be2e
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/layout/base/nsCSSRendering.cpp b/layout/base/nsCSSRendering.cpp
@@ -2486,6 +2486,10 @@ nsCSSRendering::PaintGradient(nsPresContext* aPresContext,
     ComputeRadialGradientLine(aPresContext, aGradient, srcSize,
                               &lineStart, &lineEnd, &radiusX, &radiusY);
   }
+  // Avoid sending Infs or Nans to downwind draw targets.
+  if (!lineStart.IsFinite() || !lineEnd.IsFinite()) {
+    lineStart = lineEnd = gfxPoint(0, 0);
+  }
   gfxFloat lineLength = NS_hypot(lineEnd.x - lineStart.x,
                                   lineEnd.y - lineStart.y);