[PATCH] time: zero old_value in timer_settime

[Andrei Vagin]

Currently timer_settime() returns random data in old_value

timer_settime(10, 0, {it_interval={tv_sec=0, tv_nsec=0},
                      it_value={tv_sec=2147483, tv_nsec=647000000}}, NULL) = 0
...
timer_settime(10, 0, {it_interval={tv_sec=0, tv_nsec=0},
                      it_value={tv_sec=0, tv_nsec=0}},
                     {it_interval={tv_sec=-1861316067,
                                   tv_nsec=18446645490300239488},
                      it_value={tv_sec=-1852565060, tv_nsec=133}}) = 0

Fixes: eabdec043853 ("posix-timers: Zero settings value in common code")
Cc: Thomas Gleixner <t...@linutronix.de>
Signed-off-by: Andrei Vagin <ava...@openvz.org>
---
 kernel/time/posix-timers.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/time/posix-timers.c b/kernel/time/posix-timers.c
index 6e7a70b1..e684cbb 100644
--- a/kernel/time/posix-timers.c
+++ b/kernel/time/posix-timers.c
@@ -833,6 +833,9 @@ SYSCALL_DEFINE4(timer_settime, timer_t, timer_id, int, 
flags,
        if (!timr)
                return -EINVAL;
 
+       if (rtn)
+               memset(rtn, 0, sizeof(*rtn));
+
        kc = timr->kclock;
        if (WARN_ON_ONCE(!kc || !kc->timer_set))
                error = -EINVAL;
-- 
2.9.4