[PATCH 3/4] pinctrl: samsung: Fix device node refcount leaks in S3C64xx wakeup controller init

From: Krzysztof Kozlowski <krzk@kernel.org>
To: Tomasz Figa <tomasz.figa@gmail.com>,
	Krzysztof Kozlowski <krzk@kernel.org>,
	Sylwester Nawrocki <s.nawrocki@samsung.com>,
	Linus Walleij <linus.walleij@linaro.org>,
	Kukjin Kim <kgene@kernel.org>,
	linux-arm-kernel@lists.infradead.org,
	linux-samsung-soc@vger.kernel.org, linux-gpio@vger.kernel.org,
	linux-kernel@vger.kernel.org
Cc: Chanwoo Choi <cw00.choi@samsung.com>,
	Marek Szyprowski <m.szyprowski@samsung.com>,
	notify@kernel.org
Subject: [PATCH 3/4] pinctrl: samsung: Fix device node refcount leaks in S3C64xx wakeup controller init
Date: Mon,  5 Aug 2019 18:27:09 +0200	[thread overview]
Message-ID: <20190805162710.7789-3-krzk@kernel.org> (raw)
In-Reply-To: <20190805162710.7789-1-krzk@kernel.org>

In s3c64xx_eint_eint0_init() the for_each_child_of_node() loop is used
with a break to find a matching child node.  Although each iteration of
for_each_child_of_node puts the previous node, but early exit from loop
misses it.  This leads to leak of device node.

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
---
 drivers/pinctrl/samsung/pinctrl-s3c64xx.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/pinctrl/samsung/pinctrl-s3c64xx.c b/drivers/pinctrl/samsung/pinctrl-s3c64xx.c
index c399f0932af5..f97f8179f2b1 100644
--- a/drivers/pinctrl/samsung/pinctrl-s3c64xx.c
+++ b/drivers/pinctrl/samsung/pinctrl-s3c64xx.c
@@ -704,8 +704,10 @@ static int s3c64xx_eint_eint0_init(struct samsung_pinctrl_drv_data *d)
 		return -ENODEV;
 
 	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
-	if (!data)
+	if (!data) {
+		of_node_put(eint0_np);
 		return -ENOMEM;
+	}
 	data->drvdata = d;
 
 	for (i = 0; i < NUM_EINT0_IRQ; ++i) {
@@ -714,6 +716,7 @@ static int s3c64xx_eint_eint0_init(struct samsung_pinctrl_drv_data *d)
 		irq = irq_of_parse_and_map(eint0_np, i);
 		if (!irq) {
 			dev_err(dev, "failed to get wakeup EINT IRQ %d\n", i);
+			of_node_put(eint0_np);
 			return -ENXIO;
 		}
 
@@ -721,6 +724,7 @@ static int s3c64xx_eint_eint0_init(struct samsung_pinctrl_drv_data *d)
 						 s3c64xx_eint0_handlers[i],
 						 data);
 	}
+	of_node_put(eint0_np);
 
 	bank = d->pin_banks;
 	for (i = 0; i < d->nr_banks; ++i, ++bank) {
-- 
2.17.1

