1 files changed, 3 insertions, 1 deletions

diff --git a/kernel/acct.c b/kernel/acct.c
index 521dfa53cb99..7ff5339a3f05 100644
--- a/kernel/acct.c
+++ b/kernel/acct.c
@@ -482,7 +482,9 @@ static void do_acct_process(struct file *file)
 #endif
 #if ACCT_VERSION==3
         ac.ac_pid = current->tgid;
-        ac.ac_ppid = current->real_parent->tgid;
+        rcu_read_lock();
+        ac.ac_ppid = rcu_dereference(current->real_parent)->tgid;
+        rcu_read_unlock();
 #endif
 
         spin_lock_irq(&current->sighand->siglock);