[PATCH] clockevent: sun4i: Fix race condition in the probe code

[PATCH] clockevent: sun4i: Fix race condition in the probe code

[Maxime Ripard]

The interrupts were activated and the handler registered before the clockevent
was registered in the probe function.

The interrupt handler, however, was making the assumption that the clockevent
device was registered.

That could cause a null pointer dereferenc if the timer interrupt was firing
during this narrow window.

Fix that by moving the clockevent registration before the interrupt is enabled.

Reported-by: Roman Byshko <rbyshko@gmail.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Cc: stable at vger.kernel.org
---
 drivers/clocksource/sun4i_timer.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/clocksource/sun4i_timer.c b/drivers/clocksource/sun4i_timer.c
index efb17c3ee120..f4a9c0058b4d 100644
--- a/drivers/clocksource/sun4i_timer.c
+++ b/drivers/clocksource/sun4i_timer.c
@@ -182,6 +182,12 @@ static void __init sun4i_timer_init(struct device_node *node)
 	/* Make sure timer is stopped before playing with interrupts */
 	sun4i_clkevt_time_stop(0);
 
+	sun4i_clockevent.cpumask = cpu_possible_mask;
+	sun4i_clockevent.irq = irq;
+
+	clockevents_config_and_register(&sun4i_clockevent, rate,
+					TIMER_SYNC_TICKS, 0xffffffff);
+
 	ret = setup_irq(irq, &sun4i_timer_irq);
 	if (ret)
 		pr_warn("failed to setup irq %d\n", irq);
@@ -189,12 +195,6 @@ static void __init sun4i_timer_init(struct device_node *node)
 	/* Enable timer0 interrupt */
 	val = readl(timer_base + TIMER_IRQ_EN_REG);
 	writel(val | TIMER_IRQ_EN(0), timer_base + TIMER_IRQ_EN_REG);
-
-	sun4i_clockevent.cpumask = cpu_possible_mask;
-	sun4i_clockevent.irq = irq;
-
-	clockevents_config_and_register(&sun4i_clockevent, rate,
-					TIMER_SYNC_TICKS, 0xffffffff);
 }
 CLOCKSOURCE_OF_DECLARE(sun4i, "allwinner,sun4i-a10-timer",
 		       sun4i_timer_init);
-- 
2.1.1

[PATCH] clockevent: sun4i: Fix race condition in the probe code

[Daniel Lezcano]

On 11/18/2014 11:59 PM, Maxime Ripard wrote:
> The interrupts were activated and the handler registered before the clockevent
> was registered in the probe function.
>
> The interrupt handler, however, was making the assumption that the clockevent
> device was registered.
>
> That could cause a null pointer dereferenc if the timer interrupt was firing
> during this narrow window.
>
> Fix that by moving the clockevent registration before the interrupt is enabled.
>
> Reported-by: Roman Byshko <rbyshko@gmail.com>
> Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
> Cc: stable at vger.kernel.org

Applied to my tree as 3.18 fix.

Thanks !

   -- Daniel

> ---
>   drivers/clocksource/sun4i_timer.c | 12 ++++++------
>   1 file changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/clocksource/sun4i_timer.c b/drivers/clocksource/sun4i_timer.c
> index efb17c3ee120..f4a9c0058b4d 100644
> --- a/drivers/clocksource/sun4i_timer.c
> +++ b/drivers/clocksource/sun4i_timer.c
> @@ -182,6 +182,12 @@ static void __init sun4i_timer_init(struct device_node *node)
>   	/* Make sure timer is stopped before playing with interrupts */
>   	sun4i_clkevt_time_stop(0);
>
> +	sun4i_clockevent.cpumask = cpu_possible_mask;
> +	sun4i_clockevent.irq = irq;
> +
> +	clockevents_config_and_register(&sun4i_clockevent, rate,
> +					TIMER_SYNC_TICKS, 0xffffffff);
> +
>   	ret = setup_irq(irq, &sun4i_timer_irq);
>   	if (ret)
>   		pr_warn("failed to setup irq %d\n", irq);
> @@ -189,12 +195,6 @@ static void __init sun4i_timer_init(struct device_node *node)
>   	/* Enable timer0 interrupt */
>   	val = readl(timer_base + TIMER_IRQ_EN_REG);
>   	writel(val | TIMER_IRQ_EN(0), timer_base + TIMER_IRQ_EN_REG);
> -
> -	sun4i_clockevent.cpumask = cpu_possible_mask;
> -	sun4i_clockevent.irq = irq;
> -
> -	clockevents_config_and_register(&sun4i_clockevent, rate,
> -					TIMER_SYNC_TICKS, 0xffffffff);
>   }
>   CLOCKSOURCE_OF_DECLARE(sun4i, "allwinner,sun4i-a10-timer",
>   		       sun4i_timer_init);
>


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