Initial error handling code

src/effects/SkLightingImageFilter.cpp

Index: src/effects/SkLightingImageFilter.cpp
diff --git a/src/effects/SkLightingImageFilter.cpp b/src/effects/SkLightingImageFilter.cpp
index 999b8f8bfa2863e54e71adfc628fc475f2e71eb5..54e920cdc496a13714adb717cf17c3f5d05f1b56 100644
--- a/src/effects/SkLightingImageFilter.cpp
+++ b/src/effects/SkLightingImageFilter.cpp
@@ -249,6 +249,9 @@ SkPoint3 readPoint3(SkFlattenableReadBuffer& buffer) {
     point.fX = buffer.readScalar();
     point.fY = buffer.readScalar();
     point.fZ = buffer.readScalar();
+    buffer.validateData(SkScalarIsFinite(point.fX) &&
+                        SkScalarIsFinite(point.fY) &&
+                        SkScalarIsFinite(point.fZ));
     return point;
 };
 
@@ -741,6 +744,10 @@ protected:
         fCosInnerConeAngle = buffer.readScalar();
         fConeScale = buffer.readScalar();
         fS = readPoint3(buffer);
+        buffer.validateData(SkScalarIsFinite(fSpecularExponent) &&
+                            SkScalarIsFinite(fCosOuterConeAngle) &&
+                            SkScalarIsFinite(fCosInnerConeAngle) &&
+                            SkScalarIsFinite(fConeScale));
     }
     SkSpotLight(const SkPoint3& location, const SkPoint3& target, SkScalar specularExponent, SkScalar cosOuterConeAngle, SkScalar cosInnerConeAngle, SkScalar coneScale, const SkPoint3& s, const SkPoint3& color)
      : INHERITED(color),
@@ -862,6 +869,7 @@ SkLightingImageFilter::SkLightingImageFilter(SkFlattenableReadBuffer& buffer)
 {
     fLight = buffer.readFlattenableT<SkLight>();
     fSurfaceScale = buffer.readScalar();
+    buffer.validateData(SkScalarIsFinite(fSurfaceScale));
 }
 
 void SkLightingImageFilter::flatten(SkFlattenableWriteBuffer& buffer) const {
@@ -882,6 +890,7 @@ SkDiffuseLightingImageFilter::SkDiffuseLightingImageFilter(SkFlattenableReadBuff
   : INHERITED(buffer)
 {
     fKD = buffer.readScalar();
+    buffer.validateData(SkScalarIsFinite(fKD));
 }
 
 void SkDiffuseLightingImageFilter::flatten(SkFlattenableWriteBuffer& buffer) const {
@@ -959,6 +968,8 @@ SkSpecularLightingImageFilter::SkSpecularLightingImageFilter(SkFlattenableReadBu
 {
     fKS = buffer.readScalar();
     fShininess = buffer.readScalar();
+    buffer.validateData(SkScalarIsFinite(fKS) &&
+                        SkScalarIsFinite(fShininess));
 }
 
 void SkSpecularLightingImageFilter::flatten(SkFlattenableWriteBuffer& buffer) const {