diff --git a/security/tomoyo/common.h b/security/tomoyo/common.h
index ed311d7a8ce0547afab1e4570aa1b29898b9bdf0..cb9f5c2d6f3ab6c27d6a79f3f7c8786a5cb82ad7 100644
--- 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;
 }