Fix data view accessors to throw execptions on offsets bigger than size_t.

src/runtime.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1194 matching lines @@
 }
 
 
 template<typename T>
 inline static bool DataViewGetValue(
     Isolate* isolate,
     Handle<JSDataView> data_view,
     Handle<Object> byte_offset_obj,
     bool is_little_endian,
     T* result) {
-  size_t byte_offset = NumberToSize(isolate, *byte_offset_obj);
+  size_t byte_offset = 0;
+  if (!TryNumberToSize(isolate, *byte_offset_obj, &byte_offset)) {
+    return false;
+  }
   Handle<JSArrayBuffer> buffer(JSArrayBuffer::cast(data_view->buffer()));
 
   size_t data_view_byte_offset =
       NumberToSize(isolate, data_view->byte_offset());
   size_t data_view_byte_length =
       NumberToSize(isolate, data_view->byte_length());
   if (byte_offset + sizeof(T) > data_view_byte_length ||
       byte_offset + sizeof(T) < byte_offset)  {  // overflow
     return false;
   }
@@ skipping 20 matching lines @@
 }
 
 
 template<typename T>
 static bool DataViewSetValue(
     Isolate* isolate,
     Handle<JSDataView> data_view,
     Handle<Object> byte_offset_obj,
     bool is_little_endian,
     T data) {
-  size_t byte_offset = NumberToSize(isolate, *byte_offset_obj);
+  size_t byte_offset = 0;
+  if (!TryNumberToSize(isolate, *byte_offset_obj, &byte_offset)) {
+    return false;
+  }
   Handle<JSArrayBuffer> buffer(JSArrayBuffer::cast(data_view->buffer()));
 
   size_t data_view_byte_offset =
       NumberToSize(isolate, data_view->byte_offset());
   size_t data_view_byte_length =
       NumberToSize(isolate, data_view->byte_length());
   if (byte_offset + sizeof(T) > data_view_byte_length ||
       byte_offset + sizeof(T) < byte_offset)  {  // overflow
     return false;
   }
@@ skipping 13632 matching lines @@
     // Handle last resort GC and make sure to allow future allocations
     // to grow the heap without causing GCs (if possible).
     isolate->counters()->gc_last_resort_from_js()->Increment();
     isolate->heap()->CollectAllGarbage(Heap::kNoGCFlags,
                                        "Runtime::PerformGC");
   }
 }
 
 
 } }  // namespace v8::internal