1 files changed, 4 insertions, 3 deletions

diff --git a/fs/proc/array.c b/fs/proc/array.c
index 07d6c4853fe8..dca997a93bff 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -73,6 +73,7 @@
 #include <linux/signal.h>
 #include <linux/highmem.h>
 #include <linux/file.h>
+#include <linux/fdtable.h>
 #include <linux/times.h>
 #include <linux/cpuset.h>
 #include <linux/rcupdate.h>
@@ -425,12 +426,13 @@ static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
         cutime = cstime = utime = stime = cputime_zero;
         cgtime = gtime = cputime_zero;
 
-        rcu_read_lock();
         if (lock_task_sighand(task, &flags)) {
                 struct signal_struct *sig = task->signal;
 
                 if (sig->tty) {
-                        tty_pgrp = pid_nr_ns(sig->tty->pgrp, ns);
+                        struct pid *pgrp = tty_get_pgrp(sig->tty);
+                        tty_pgrp = pid_nr_ns(pgrp, ns);
+                        put_pid(pgrp);
                         tty_nr = new_encode_dev(tty_devnum(sig->tty));
                 }
 
@@ -469,7 +471,6 @@ static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
 
                 unlock_task_sighand(task, &flags);
         }
-        rcu_read_unlock();
 
         if (!whole || num_threads < 2)
                 wchan = get_wchan(task);