Fix missing exception check in typed array constructor.

src/d8.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 514 matching lines @@
       if (try_catch.HasCaught()) return try_catch.ReThrow();
       byteLength = length * element_size;
       if (byteOffset + byteLength > bufferLength) {
         return Throw("length out of bounds");
       }
     }
   } else {
     if (args[0]->IsObject() &&
         args[0]->ToObject()->Has(Symbols::length(isolate))) {
       // Construct from array.
-      length = convertToUint(
-          args[0]->ToObject()->Get(Symbols::length(isolate)), &try_catch);
+      Local<Value> value = args[0]->ToObject()->Get(Symbols::length(isolate));
+      if (try_catch.HasCaught()) return try_catch.ReThrow();
+      length = convertToUint(value, &try_catch);
       if (try_catch.HasCaught()) return try_catch.ReThrow();
       init_from_array = true;
     } else {
       // Construct from size.
       length = convertToUint(args[0], &try_catch);
       if (try_catch.HasCaught()) return try_catch.ReThrow();
     }
     byteLength = length * element_size;
     byteOffset = 0;
 
@@ skipping 1415 matching lines @@
 }
 
 }  // namespace v8
 
 
 #ifndef GOOGLE3
 int main(int argc, char* argv[]) {
   return v8::Shell::Main(argc, argv);
 }
 #endif