Fix stack buffer read overflow in GrConvolutionEffect::TestCreate.

src/gpu/effects/GrConvolutionEffect.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrConvolutionEffect.h"
 #include "gl/GrGLEffect.h"
 #include "gl/GrGLEffectMatrix.h"
@@ skipping 209 matching lines @@
 GR_DEFINE_EFFECT_TEST(GrConvolutionEffect);
 
 GrEffectRef* GrConvolutionEffect::TestCreate(SkMWCRandom* random,
                                              GrContext*,
                                              const GrDrawTargetCaps&,
                                              GrTexture* textures[]) {
     int texIdx = random->nextBool() ? GrEffectUnitTest::kSkiaPMTextureIdx :
                                       GrEffectUnitTest::kAlphaTextureIdx;
     Direction dir = random->nextBool() ? kX_Direction : kY_Direction;
     int radius = random->nextRangeU(1, kMaxKernelRadius);
-    float kernel[kMaxKernelRadius];
-    for (int i = 0; i < kMaxKernelRadius; ++i) {
+    float kernel[kMaxKernelWidth];
+    for (size_t i = 0; i < SK_ARRAY_COUNT(kernel); ++i) {
         kernel[i] = random->nextSScalar1();
     }
     float bounds[2];
     for (int i = 0; i < 2; ++i) {
         bounds[i] = random->nextF();
     }
 
     bool useBounds = random->nextBool();
     return GrConvolutionEffect::Create(textures[texIdx],
                                        dir,
                                        radius,
                                        kernel,
                                        useBounds,
                                        bounds);
 }