Make string_util::WriteInto() DCHECK() that the supplied |length_with_null| > 1, meaning that the...

base/rand_util.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 "base/rand_util.h"
 
 #include <math.h>
 
 #include <limits>
 
@@ skipping 53 matching lines @@
   uint64 random_int;
   size_t random_int_size = sizeof(random_int);
   for (size_t i = 0; i < output_length; i += random_int_size) {
     random_int = base::RandUint64();
     size_t copy_count = std::min(output_length - i, random_int_size);
     memcpy(((uint8*)output) + i, &random_int, copy_count);
   }
 }
 
 std::string RandBytesAsString(size_t length) {
+  DCHECK_GT(length, 0u);
   std::string result;
   RandBytes(WriteInto(&result, length + 1), length);
   return result;
 }
 
 }  // namespace base