clockevent: sun4i: Fix race condition in the probe code

commit 6bab4a8a1888729f17f4923cc5867e4674f66333 upstream.

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 dereference 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>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/clocksource/sun4i_timer.c b/drivers/clocksource/sun4i_timer.c
index bf497af..7d19f86 100644 (file)
--- 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-timer",
                       sun4i_timer_init);