Check result of JSObject::NormalizeProperties() in JSObject::PreventExtension...

src/objects.cc

 // Copyright 2006-2009 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 2665 matching lines @@
   }
 
   // No references to object.
   return false;
 }
 
 
 Object* JSObject::PreventExtensions() {
   // If there are fast elements we normalize.
   if (HasFastElements()) {
-    NormalizeElements();
+    Object* ok = NormalizeElements();
+    if (ok->IsFailure()) return ok;
   }
   // Make sure that we never go back to fast case.
   element_dictionary()->set_requires_slow_elements();
 
   // Do a map transition, other objects with this map may still
   // be extensible.
   Object* new_map = map()->CopyDropTransitions();
   if (new_map->IsFailure()) return new_map;
   Map::cast(new_map)->set_is_extensible(false);
   set_map(Map::cast(new_map));
@@ skipping 6190 matching lines @@
   if (break_point_objects()->IsUndefined()) return 0;
   // Single beak point.
   if (!break_point_objects()->IsFixedArray()) return 1;
   // Multiple break points.
   return FixedArray::cast(break_point_objects())->length();
 }
 #endif
 
 
 } }  // namespace v8::internal