Initial error handling code

src/effects/SkMorphologyImageFilter.cpp

 /*
  * Copyright 2012 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkMorphologyImageFilter.h"
 #include "SkBitmap.h"
 #include "SkColorPriv.h"
 #include "SkFlattenableBuffers.h"
 #include "SkRect.h"
 #if SK_SUPPORT_GPU
 #include "GrContext.h"
 #include "GrTexture.h"
 #include "GrTBackendEffectFactory.h"
 #include "gl/GrGLEffect.h"
 #include "effects/Gr1DKernelEffect.h"
 #include "SkImageFilterUtils.h"
 #endif
 
 SkMorphologyImageFilter::SkMorphologyImageFilter(SkFlattenableReadBuffer& buffer)
   : INHERITED(buffer) {
     fRadius.fWidth = buffer.readInt();
     fRadius.fHeight = buffer.readInt();
+    buffer.validate((fRadius.fWidth >= 0) &&
+                    (fRadius.fHeight >= 0));
 }
 
 SkMorphologyImageFilter::SkMorphologyImageFilter(int radiusX, int radiusY, SkImageFilter* input, const CropRect* cropRect)
     : INHERITED(input, cropRect), fRadius(SkISize::Make(radiusX, radiusY)) {
 }
 
 
 void SkMorphologyImageFilter::flatten(SkFlattenableWriteBuffer& buffer) const {
     this->INHERITED::flatten(buffer);
     buffer.writeInt(fRadius.fWidth);
@@ skipping 545 matching lines @@
 
     if (!apply_morphology(input, bounds, GrMorphologyEffect::kErode_MorphologyType, radius(), result)) {
         return false;
     }
     offset->fX += bounds.left();
     offset->fY += bounds.top();
     return true;
 }
 
 #endif