linux-kernel - [GIT pull] timer fix for 4.10

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Message-ID: <alpine.DEB.2.20.1612181450020.3628@nanos>
Date:   Sun, 18 Dec 2016 14:51:43 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
cc:     LKML <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Ingo Molnar <mingo@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>
Subject: [GIT pull] timer fix for 4.10

Linus,

please pull the latest timers-urgent-for-linus git tree from:

 git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git timers-urgent-for-linus

Prevent NULL pointer dereferencing in the tick broadcast code. Old bug,
which got unearthed by the hotplug ordering problem.

Thanks,

	tglx

------------------>
Thomas Gleixner (1):
      tick/broadcast: Prevent NULL pointer dereference


 kernel/time/tick-broadcast.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c
index f6aae7977824..d2a20e83ebae 100644
--- a/kernel/time/tick-broadcast.c
+++ b/kernel/time/tick-broadcast.c
@@ -871,6 +871,9 @@ void tick_broadcast_setup_oneshot(struct clock_event_device *bc)
 {
 	int cpu = smp_processor_id();
 
+	if (!bc)
+		return;
+
 	/* Set it up only once ! */
 	if (bc->event_handler != tick_handle_oneshot_broadcast) {
 		int was_periodic = clockevent_state_periodic(bc);