Fixed issue found by clusterfuzz

include/core/SkReader32.h

 
 /*
  * Copyright 2008 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.
  */
 
 
 #ifndef SkReader32_DEFINED
@@ skipping 22 matching lines @@
         fStop = (const char*)data + size;
     }
 
     size_t size() const { return fStop - fBase; }
     size_t offset() const { return fCurr - fBase; }
     bool eof() const { return fCurr >= fStop; }
     const void* base() const { return fBase; }
     const void* peek() const { return fCurr; }
 
     size_t available() const { return fStop - fCurr; }
-    bool isAvailable(size_t size) const { return fCurr + size <= fStop; }
+    bool isAvailable(size_t size) const { return size <= this->available(); }
 
     void rewind() { fCurr = fBase; }
 
     void setOffset(size_t offset) {
         SkASSERT(SkAlign4(offset) == offset);
         SkASSERT(offset <= this->size());
         fCurr = fBase + offset;
     }
 
     bool readBool() { return this->readInt() != 0; }
@@ skipping 97 matching lines @@
     const char* fBase;  // beginning of buffer
 
 #ifdef SK_DEBUG
     static bool ptr_align_4(const void* ptr) {
         return (((const char*)ptr - (const char*)NULL) & 3) == 0;
     }
 #endif
 };
 
 #endif