Fixed issues found by fuzzer

src/effects/SkBicubicImageFilter.cpp

 /*
  * Copyright 2013 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 "SkBicubicImageFilter.h"
 #include "SkBitmap.h"
 #include "SkColorPriv.h"
@@ skipping 80 matching lines @@
 
     SkAutoLockPixels alp(src);
     if (!src.getPixels()) {
         return false;
     }
 
     SkRect dstRect = SkRect::MakeWH(SkScalarMul(SkIntToScalar(src.width()), fScale.fWidth),
                                     SkScalarMul(SkIntToScalar(src.height()), fScale.fHeight));
     SkIRect dstIRect;
     dstRect.roundOut(&dstIRect);
+    if (dstIRect.isEmpty()) {
+        return false;
+    }
     result->setConfig(src.config(), dstIRect.width(), dstIRect.height());
     result->allocPixels();
     if (!result->getPixels()) {
         return false;
     }
 
     SkRect srcRect;
     src.getBounds(&srcRect);
     SkMatrix inverse;
     inverse.setRectToRect(dstRect, srcRect, SkMatrix::kFill_ScaleToFit);
@@ skipping 73 matching lines @@
     GrPaint paint;
     paint.addColorEffect(GrBicubicEffect::Create(srcTexture, fCoefficients))->unref();
     SkRect srcRect;
     srcBM.getBounds(&srcRect);
     context->drawRectToRect(paint, dstRect, srcRect);
     return SkImageFilterUtils::WrapTexture(dst, desc.fWidth, desc.fHeight, result);
 }
 #endif
 
 ///////////////////////////////////////////////////////////////////////////////