linux-kernel - [PATCH] clocksource: Fix refcount leak bug in time-ti-dm-systimer

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Date:   Fri, 17 Jun 2022 21:32:09 +0800
From:   Liang He <windhl@....com>
To:     daniel.lezcano@...aro.org, tglx@...utronix.de,
        linux-kernel@...r.kernel.org, windhl@....com
Subject: [PATCH] clocksource: Fix refcount leak bug in time-ti-dm-systimer

In dmtimer_percpu_quirk_init(), of_find_compatible_node() will return
a node pointer with refcount incremented. We should use of_node_put()
in fail path or when it is not used anymore.

Signed-off-by: Liang He <windhl@....com>
---
 drivers/clocksource/timer-ti-dm-systimer.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/clocksource/timer-ti-dm-systimer.c b/drivers/clocksource/timer-ti-dm-systimer.c
index 2737407ff069..f414cb553649 100644
--- a/drivers/clocksource/timer-ti-dm-systimer.c
+++ b/drivers/clocksource/timer-ti-dm-systimer.c
@@ -690,10 +690,11 @@ static int __init dmtimer_percpu_quirk_init(struct device_node *np, u32 pa)
 
 	arm_timer = of_find_compatible_node(NULL, NULL, "arm,armv7-timer");
 	if (of_device_is_available(arm_timer)) {
+		of_node_put(arm_timer);
 		pr_warn_once("ARM architected timer wrap issue i940 detected\n");
 		return 0;
 	}
-
+	of_node_put(arm_timer);
 	if (pa == 0x4882c000)           /* dra7 dmtimer15 */
 		return dmtimer_percpu_timer_init(np, 0);
 	else if (pa == 0x4882e000)      /* dra7 dmtimer16 */
-- 
2.25.1