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tick/broadcast: Prevent NULL pointer dereference 

Dan reported that the recent changes to the broadcast code introduced
a potential NULL dereference.

Add the proper check.

Fixes: e045431190 "tick/broadcast: Sanity check the shutdown of the local clock_event"
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Thomas Gleixner 2015-07-11 14:26:34 +02:00
parent 1f6823faa8
commit c4d029f2d4
1 changed files with 10 additions and 8 deletions
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2
kernel/time/tick-broadcast.c
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@ -409,6 +409,7 @@ void tick_broadcast_control(enum tick_broadcast_mode mode)
break;
}
if (bc) {
if (cpumask_empty(tick_broadcast_mask)) {
if (!bc_stopped)
clockevents_shutdown(bc);
@ -418,6 +419,7 @@ void tick_broadcast_control(enum tick_broadcast_mode mode)
else
tick_broadcast_setup_oneshot(bc);
}
}
raw_spin_unlock(&tick_broadcast_lock);
}
EXPORT_SYMBOL_GPL(tick_broadcast_control);