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| author | Thomas Gleixner <tglx@linutronix.de> | 2017-06-12 20:44:09 +0300 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2017-06-12 22:07:40 +0300 |
| commit | 5c7a3a3d20a4e175304c0e23809e3d70be8fed8a (patch) | |
| tree | 1787d47a161f70947dd6865ae4527054f46895bc /kernel/time | |
| parent | c6503be587e9c5c0aac4e2b45de982352f676a5b (diff) | |
| download | linux-5c7a3a3d20a4e175304c0e23809e3d70be8fed8a.tar.xz | |
posix-timers: Zero out oldval itimerspec
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: eabdec043853 ("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
Diffstat (limited to 'kernel/time')
| -rw-r--r-- | kernel/time/posix-timers.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/time/posix-timers.c b/kernel/time/posix-timers.c index b53a0b562516..88517dcfe0ca 100644 --- a/kernel/time/posix-timers.c +++ b/kernel/time/posix-timers.c @@ -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) |