apparmor: add missing rcu_dereference()

Adds a missed rcu_dereference() around real_parent.

Signed-off-by: Kees Cook <keescook@chromium.org>
Acked-by: John Johansen <john.johansen@canonical.com>
Signed-off-by: James Morris <jmorris@namei.org>

diff --git a/security/apparmor/audit.c b/security/apparmor/audit.c
index 96502b22b268626ee1496057dba45f16c5c2d2ed..f3fafedd798a9abc9734b1e80379b05fe3892daa 100644 (file)
--- a/security/apparmor/audit.c
+++ b/security/apparmor/audit.c
@@ -133,7 +133,7 @@ static void audit_pre(struct audit_buffer *ab, void *ca)
                struct aa_profile *profile = sa->aad.profile;
                pid_t pid;
                rcu_read_lock();
-               pid = tsk->real_parent->pid;
+               pid = rcu_dereference(tsk->real_parent)->pid;
                rcu_read_unlock();
                audit_log_format(ab, " parent=%d", pid);
                if (profile->ns != root_ns) {