sqlite_utils: don't dereference an empty vector.

chrome/browser/sync/util/data_encryption.cc

 // Copyright (c) 2009 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.
 //
 // NOTE: this file is Winodws specific.
 
 #include "chrome/browser/sync/util/data_encryption.h"
 
 #include <windows.h>
 #include <wincrypt.h>
 
 #include <cstddef>
 #include <string>
 #include <vector>
 
 using std::string;
 using std::vector;
 
 vector<uint8> EncryptData(const string& data) {
-  DATA_BLOB unencrypted_data, encrypted_data;
+  DATA_BLOB unencrypted_data = { 0 };
   unencrypted_data.pbData = (BYTE*)(data.data());
   unencrypted_data.cbData = data.size();
+  DATA_BLOB encrypted_data = { 0 };
 
   if (!CryptProtectData(&unencrypted_data, L"", NULL, NULL, NULL, 0,
                         &encrypted_data))
     LOG(ERROR) << "Encryption fails: " << data;
 
   vector<uint8> result(encrypted_data.pbData,
                        encrypted_data.pbData + encrypted_data.cbData);
   LocalFree(encrypted_data.pbData);
   return result;
 }
 
 bool DecryptData(const vector<uint8>& in_data, string* out_data) {
   DATA_BLOB encrypted_data, decrypted_data;
   encrypted_data.pbData =
     (in_data.empty() ? NULL : const_cast<BYTE*>(&in_data[0]));
   encrypted_data.cbData = in_data.size();
   LPWSTR descrip = L"";
 
   if (!CryptUnprotectData(&encrypted_data, &descrip, NULL, NULL, NULL, 0,
                           &decrypted_data)) {
     LOG(ERROR) << "Decryption fails: ";
     return false;
   } else {
     out_data->assign(reinterpret_cast<const char*>(decrypted_data.pbData),
                      decrypted_data.cbData);
     LocalFree(decrypted_data.pbData);
     return true;
   }
 }