tomoyo: avoid get+put of task_struct

Use task_cred_xxx(task, security) in tomoyo_real_domain() to
avoid a get+put of the target cred.

Signed-off-by: Serge E. Hallyn <serue@us.ibm.com>
Acked-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: James Morris <jmorris@namei.org>

1 files changed, 1 insertions, 8 deletions

diff --git a/security/tomoyo/tomoyo.h b/security/tomoyo/tomoyo.h
index 41c6ebafb9c5..f12d5ada7dcb 100644
--- a/security/tomoyo/tomoyo.h
+++ b/security/tomoyo/tomoyo.h
@@ -90,17 +90,10 @@ static inline struct tomoyo_domain_info *tomoyo_domain(void)
         return current_cred()->security;
 }
 
-/* Caller holds tasklist_lock spinlock. */
 static inline struct tomoyo_domain_info *tomoyo_real_domain(struct task_struct
                                                             *task)
 {
-        /***** CRITICAL SECTION START *****/
-        const struct cred *cred = get_task_cred(task);
-        struct tomoyo_domain_info *domain = cred->security;
-
-        put_cred(cred);
-        return domain;
-        /***** CRITICAL SECTION END *****/
+        return task_cred_xxx(task, security);
 }
 
 #endif /* !defined(_SECURITY_TOMOYO_TOMOYO_H) */