Fix segfault in RestoreOnStartupPolicyHandler

chrome/browser/policy/configuration_policy_handler.cc

 // Copyright (c) 2012 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 "chrome/browser/policy/configuration_policy_handler.h"
 
 #include <string>
 
 #include "base/file_path.h"
 #include "base/json/json_writer.h"
@@ skipping 979 matching lines @@
   // If the restore urls at start up policy is set, session cookies are treated
   // as permanent cookies and site data needed to restore the session is not
   // cleared so we have to warn the user in that case.
   const base::Value* restore_policy = policies.GetValue(key::kRestoreOnStartup);
 
   if (restore_policy) {
     int restore_value;
     if (restore_policy->GetAsInteger(&restore_value) &&
         SessionStartupPref::PrefValueToType(restore_value) ==
             SessionStartupPref::LAST) {
+
       const base::Value* cookies_policy =
           policies.GetValue(key::kCookiesSessionOnlyForUrls);
-      const base::Value* exit_policy =
-          policies.GetValue(key::kClearSiteDataOnExit);
-
       const base::ListValue *cookies_value;
-      if (cookies_policy->GetAsList(&cookies_value) &&
+      if (cookies_policy && cookies_policy->GetAsList(&cookies_value) &&
           !cookies_value->empty()) {
         errors->AddError(key::kCookiesSessionOnlyForUrls,
                          IDS_POLICY_OVERRIDDEN,
                          key::kRestoreOnStartup);
       }
 
+      const base::Value* exit_policy =
+          policies.GetValue(key::kClearSiteDataOnExit);
       bool exit_value;
-      if (exit_policy->GetAsBoolean(&exit_value) && exit_value) {
+      if (exit_policy && exit_policy->GetAsBoolean(&exit_value) && exit_value) {
         errors->AddError(key::kClearSiteDataOnExit,
                          IDS_POLICY_OVERRIDDEN,
                          key::kRestoreOnStartup);
       }
     }
   }
-
   return true;
 }
 
 }  // namespace policy