base::HexStringToInt conversion function treats the string "0x" as a valid hex number

base/string_number_conversions.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/string_number_conversions.h"
 
 #include <ctype.h>
 #include <errno.h>
 #include <stdlib.h>
 #include <wctype.h>
@@ skipping 202 matching lines @@
     static bool Invoke(const_iterator begin, const_iterator end,
                        typename traits::value_type* output) {
       *output = 0;
 
       if (begin == end) {
         return false;
       }
 
       // Note: no performance difference was found when using template
       // specialization to remove this check in bases other than 16
-      if (traits::kBase == 16 && end - begin >= 2 && *begin == '0' &&
+      if (traits::kBase == 16 && end - begin > 2 && *begin == '0' &&
           (*(begin + 1) == 'x' || *(begin + 1) == 'X')) {
         begin += 2;
       }
 
       for (const_iterator current = begin; current != end; ++current) {
         uint8 new_digit = 0;
 
         if (!CharToDigit<traits::kBase>(*current, &new_digit)) {
           return false;
         }
@@ skipping 302 matching lines @@
                                                                     end,
                                                                     output);
 }
 #endif
 
 bool HexStringToBytes(const std::string& input, std::vector<uint8>* output) {
   return HexStringToBytesT(input, output);
 }
 
 }  // namespace base