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posix-timers: Zero out oldval itimerspec

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The recent posix timer rework moved the clearing of the itimerspec to the
real syscall implementation, but forgot that the kclock->timer_get() is
used by timer_settime() as well. That results in an uninitialized variable
and bogus values returned to user space.

Add the missing memset to timer_settime().

Fixes: eabdec0438 ("posix-timers: Zero settings value in common code")
Reported-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Cyrill Gorcunov <gorcunov@openvz.org>
Link: http://lkml.kernel.org/r/20170609201156.GB21491@outlook.office365.com
This commit is contained in:
Thomas Gleixner 2017-06-12 19:44:09 +02:00
parent c6503be587
commit 5c7a3a3d20
1 changed files with 2 additions and 0 deletions
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2
kernel/time/posix-timers.c
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@ -828,6 +828,8 @@ SYSCALL_DEFINE4(timer_settime, timer_t, timer_id, int, flags,
if (!timespec64_valid(&new_spec64.it_interval) ||
!timespec64_valid(&new_spec64.it_value))
return -EINVAL;
if (rtn)
memset(rtn, 0, sizeof(*rtn));
retry:
timr = lock_timer(timer_id, &flag);
if (!timr)