linux-kernel - [PATCH] clocksource: dw_apb_timer_of: add handling for potential memory leak

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Date:   Tue,  2 Mar 2021 05:53:58 -0600
From:   Dinh Nguyen <dinguyen@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     dinguyen@...nel.org, tglx@...utronix.de, p.zabel@...gutronix.de,
        kernel test robot <lkp@...el.com>,
        Dan Carpenter <dan.carpenter@...cle.com>
Subject: [PATCH] clocksource: dw_apb_timer_of: add handling for potential memory leak

Add calls to disable the clock and unmap the timer base address in case
of any failures.

Reported-by: kernel test robot <lkp@...el.com>
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Dinh Nguyen <dinguyen@...nel.org>
---
 drivers/clocksource/dw_apb_timer_of.c | 26 +++++++++++++++++++++-----
 1 file changed, 21 insertions(+), 5 deletions(-)

diff --git a/drivers/clocksource/dw_apb_timer_of.c b/drivers/clocksource/dw_apb_timer_of.c
index 42e7e43b8fcd..b1e2b697b21b 100644
--- a/drivers/clocksource/dw_apb_timer_of.c
+++ b/drivers/clocksource/dw_apb_timer_of.c
@@ -52,18 +52,34 @@ static int __init timer_get_base_and_rate(struct device_node *np,
 		return 0;
 
 	timer_clk = of_clk_get_by_name(np, "timer");
-	if (IS_ERR(timer_clk))
-		return PTR_ERR(timer_clk);
+	if (IS_ERR(timer_clk)) {
+		ret = PTR_ERR(timer_clk);
+		goto out_pclk_disable;
+	}
 
 	ret = clk_prepare_enable(timer_clk);
 	if (ret)
-		return ret;
+		goto out_timer_clk_put;
 
 	*rate = clk_get_rate(timer_clk);
-	if (!(*rate))
-		return -EINVAL;
+	if (!(*rate)) {
+		ret = -EINVAL;
+		goto out_timer_clk_disable;
+	}
 
 	return 0;
+
+out_timer_clk_disable:
+	clk_disable_unprepare(timer_clk);
+out_timer_clk_put:
+	clk_put(timer_clk);
+out_pclk_disable:
+	if (!IS_ERR(pclk)) {
+		clk_disable_unprepare(pclk);
+		clk_put(pclk);
+	}
+	iounmap(*base);
+	return ret;
 }
 
 static int __init add_clockevent(struct device_node *event_timer)
-- 
2.30.0