Fixed more fuzzer issues

src/core/SkMallocPixelRef.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkMallocPixelRef.h"
 #include "SkBitmap.h"
 #include "SkFlattenableBuffers.h"
@@ skipping 125 matching lines @@
         fCTable->writeToBuffer(buffer);
     }
 }
 
 SkMallocPixelRef::SkMallocPixelRef(SkFlattenableReadBuffer& buffer)
     : INHERITED(buffer, NULL)
     , fOwnPixels(true)
 {
     fRB = buffer.read32();
     size_t size = this->info().getSafeSize(fRB);
-    fStorage = sk_malloc_throw(size);
-    buffer.readByteArray(fStorage, size);
+    if (buffer.validateAvailable(size)) {
+        fStorage = sk_malloc_throw(size);
+        buffer.readByteArray(fStorage, size);
+    } else {
+        fStorage = NULL;
+    }
+
     if (buffer.readBool()) {
         fCTable = SkNEW_ARGS(SkColorTable, (buffer));
     } else {
         fCTable = NULL;
     }
 
     this->setPreLocked(fStorage, fCTable);
 }