Fixed a few places where uninitialized memory could have been read

src/effects/SkColorFilters.cpp

 
 /*
  * Copyright 2006 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 "SkBlitRow.h"
@@ skipping 83 matching lines @@
 protected:
     virtual void flatten(SkFlattenableWriteBuffer& buffer) const SK_OVERRIDE {
         this->INHERITED::flatten(buffer);
         buffer.writeColor(fColor);
         buffer.writeUInt(fMode);
     }
 
     SkModeColorFilter(SkFlattenableReadBuffer& buffer) {
         fColor = buffer.readColor();
         fMode = (SkXfermode::Mode)buffer.readUInt();
-        this->updateCache();
-        buffer.validate(SkIsValidMode(fMode));
+        if (buffer.isValid()) {
+            this->updateCache();
+            buffer.validate(SkIsValidMode(fMode));
+        }
     }
 
 private:
     SkColor             fColor;
     SkXfermode::Mode    fMode;
     // cache
     SkPMColor           fPMColor;
     SkXfermodeProc      fProc;
     SkXfermodeProc16    fProc16;
 
@@ skipping 723 matching lines @@
     SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkModeColorFilter)
     SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(Src_SkModeColorFilter)
     SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SrcOver_SkModeColorFilter)
     SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkLightingColorFilter)
     SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkLightingColorFilter_JustAdd)
     SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkLightingColorFilter_JustMul)
     SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkLightingColorFilter_SingleMul)
     SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkLightingColorFilter_NoPin)
     SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkSimpleColorFilter)
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END