Don't crash on a NULL type-name from ObjectTypeInformation.

sandbox/src/handle_closer_agent.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "sandbox/src/handle_closer_agent.h"
 
 #include "base/logging.h"
 #include "sandbox/src/nt_internals.h"
 #include "sandbox/src/win_utils.h"
 
@@ skipping 74 matching lines @@
     while (rc == STATUS_INFO_LENGTH_MISMATCH ||
            rc == STATUS_BUFFER_OVERFLOW) {
       type_info_buffer.resize(size + sizeof(wchar_t));
       type_info = reinterpret_cast<OBJECT_TYPE_INFORMATION*>(
           &(type_info_buffer[0]));
       rc = QueryObject(handle, ObjectTypeInformation, type_info, size, &size);
       // Leave padding for the nul terminator.
       if (NT_SUCCESS(0) && size == type_info_buffer.size())
         rc = STATUS_INFO_LENGTH_MISMATCH;
     }
-    if (!NT_SUCCESS(rc)) {
+    if (!NT_SUCCESS(rc) || !type_info->Name.Buffer) {
       ++invalid_count;
       continue;
     }
 
     --handle_count;
     type_info->Name.Buffer[type_info->Name.Length / sizeof(wchar_t)] = L'\0';
 
     // Check if we're looking for this type of handle.
     HandleMap::iterator result =
         handles_to_close_.find(type_info->Name.Buffer);
@@ skipping 10 matching lines @@
         return false;
       if (!::CloseHandle(handle))
         return false;
     }
   }
 
   return true;
 }
 
 }  // namespace sandbox