posix_timer: Move copy_to_user(created_timer_id) down in timer_create()

According to Oleg Nesterov:
We can move copy_to_user(created_timer_id) down after
"if (timer_event_spec)" block too. (but before CLOCK_DISPATCH(),
of course).

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Pavel Emelyanov <xemul@openvz.org>
Cc: Stanislaw Gruszka <sgruszka@redhat.com>
Cc: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 6 insertions, 5 deletions

diff --git a/kernel/posix-timers.c b/kernel/posix-timers.c
index ad723420acc3..9ca4973f736d 100644
--- a/kernel/posix-timers.c
+++ b/kernel/posix-timers.c
@@ -560,11 +560,6 @@ SYSCALL_DEFINE3(timer_create, const clockid_t, which_clock,
         new_timer->it_clock = which_clock;
         new_timer->it_overrun = -1;
 
-        if (copy_to_user(created_timer_id,
-                         &new_timer_id, sizeof (new_timer_id))) {
-                error = -EFAULT;
-                goto out;
-        }
         if (timer_event_spec) {
                 if (copy_from_user(&event, timer_event_spec, sizeof (event))) {
                         error = -EFAULT;
@@ -590,6 +585,12 @@ SYSCALL_DEFINE3(timer_create, const clockid_t, which_clock,
         new_timer->sigq->info.si_tid   = new_timer->it_id;
         new_timer->sigq->info.si_code  = SI_TIMER;
 
+        if (copy_to_user(created_timer_id,
+                         &new_timer_id, sizeof (new_timer_id))) {
+                error = -EFAULT;
+                goto out;
+        }
+
         error = CLOCK_DISPATCH(which_clock, timer_create, (new_timer));
         if (error)
                 goto out;