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posix_cpu_timer: Exit early when process has been reaped 

commit 2c13ce8f6b2f6fd9ba2f9261b1939fc0f62d1307 upstream.

Variable "now" seems to be genuinely used unintialized
if branch

	if (CPUCLOCK_PERTHREAD(timer->it_clock)) {

is not taken and branch

	if (unlikely(sighand == NULL)) {

is taken. In this case the process has been reaped and the timer is marked as
disarmed anyway. So none of the postprocessing of the sample is
required. Return right away.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Link: http://lkml.kernel.org/r/20160707223911.GA26483@p183.telecom.by
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
[bwh: Backported to 3.16: adjust filename]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
This commit is contained in:
Alexey Dobriyan 2016-07-08 01:39:11 +03:00 committed by syphyr
parent bb914eb2f0
commit a546302c00
1 changed files with 1 additions and 0 deletions
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1
kernel/posix-cpu-timers.c
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@ -798,6 +798,7 @@ static void posix_cpu_timer_get(struct k_itimer *timer, struct itimerspec *itp)
timer->it.cpu.expires = 0;
sample_to_timespec(timer->it_clock, timer->it.cpu.expires,
&itp->it_value);
return;
} else {
cpu_timer_sample_group(timer->it_clock, p, &now);
unlock_task_sighand(p, &flags);