tomoyo: add missing rcu_dereference()

Adds a missed rcu_dereference() around real_parent.

Signed-off-by: Kees Cook <keescook@chromium.org>
Acked-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: James Morris <jmorris@namei.org>

diff --git a/security/tomoyo/common.h b/security/tomoyo/common.h
index ed311d7a8ce0547afab1e4570aa1b29898b9bdf0..cb9f5c2d6f3ab6c27d6a79f3f7c8786a5cb82ad7 100644 (file)
--- a/security/tomoyo/common.h
+++ b/security/tomoyo/common.h
@@ -1122,7 +1122,7 @@ static inline pid_t tomoyo_sys_getppid(void)
 {
        pid_t pid;
        rcu_read_lock();
-       pid = task_tgid_vnr(current->real_parent);
+       pid = task_tgid_vnr(rcu_dereference(current->real_parent));
        rcu_read_unlock();
        return pid;
 }