This is a note to let you know that I've just added the patch titled
tick/broadcast: Prevent NULL pointer dereference
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
tick-broadcast-prevent-null-pointer-dereference.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From c1a9eeb938b5433947e5ea22f89baff3182e7075 Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Date: Thu, 15 Dec 2016 12:10:37 +0100
Subject: tick/broadcast: Prevent NULL pointer dereference
From: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
commit c1a9eeb938b5433947e5ea22f89baff3182e7075 upstream.
When a disfunctional timer, e.g. dummy timer, is installed, the tick core
tries to setup the broadcast timer.
If no broadcast device is installed, the kernel crashes with a NULL pointer
dereference in tick_broadcast_setup_oneshot() because the function has no
sanity check.
Reported-by: Mason <slash.tmp@xxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Cc: Anna-Maria Gleixner <anna-maria@xxxxxxxxxxxxx>
Cc: Richard Cochran <rcochran@xxxxxxxxxxxxx>
Cc: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
Cc: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>,
Cc: Sebastian Frias <sf84@xxxxxxxxxxx>
Cc: Thibaud Cornic <thibaud_cornic@xxxxxxxxxxxxxxxx>
Cc: Robin Murphy <robin.murphy@xxxxxxx>
Link: http://lkml.kernel.org/r/1147ef90-7877-e4d2-bb2b-5c4fa8d3144b@xxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/time/tick-broadcast.c | 3 +++
1 file changed, 3 insertions(+)
--- a/kernel/time/tick-broadcast.c
+++ b/kernel/time/tick-broadcast.c
@@ -871,6 +871,9 @@ void tick_broadcast_setup_oneshot(struct
{
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);
Patches currently in stable-queue which might be from tglx@xxxxxxxxxxxxx are
queue-4.4/stable-fixup-hotplug-fix-unused-function-warning.patch
queue-4.4/irqchip-bcm7038-l1-implement-irq_cpu_offline-callback.patch
queue-4.4/tick-broadcast-prevent-null-pointer-dereference.patch
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