[PATCH 4/4] pinctrl: samsung: Fix device node refcount leaks in init code

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 4/4] pinctrl: samsung: Fix device node refcount leaks in init code
Date: Mon,  5 Aug 2019 18:27:10 +0200	[thread overview]
Message-ID: <20190805162710.7789-4-krzk@kernel.org> (raw)
In-Reply-To: <20190805162710.7789-1-krzk@kernel.org>

Several functions use for_each_child_of_node() loop 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-samsung.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/pinctrl/samsung/pinctrl-samsung.c b/drivers/pinctrl/samsung/pinctrl-samsung.c
index de0477bb469d..f26574ef234a 100644
--- a/drivers/pinctrl/samsung/pinctrl-samsung.c
+++ b/drivers/pinctrl/samsung/pinctrl-samsung.c
@@ -272,6 +272,7 @@ static int samsung_dt_node_to_map(struct pinctrl_dev *pctldev,
 						&reserved_maps, num_maps);
 		if (ret < 0) {
 			samsung_dt_free_map(pctldev, *map, *num_maps);
+			of_node_put(np);
 			return ret;
 		}
 	}
@@ -785,8 +786,10 @@ static struct samsung_pmx_func *samsung_pinctrl_create_functions(
 		if (!of_get_child_count(cfg_np)) {
 			ret = samsung_pinctrl_create_function(dev, drvdata,
 							cfg_np, func);
-			if (ret < 0)
+			if (ret < 0) {
+				of_node_put(cfg_np);
 				return ERR_PTR(ret);
+			}
 			if (ret > 0) {
 				++func;
 				++func_cnt;
@@ -797,8 +800,11 @@ static struct samsung_pmx_func *samsung_pinctrl_create_functions(
 		for_each_child_of_node(cfg_np, func_np) {
 			ret = samsung_pinctrl_create_function(dev, drvdata,
 						func_np, func);
-			if (ret < 0)
+			if (ret < 0) {
+				of_node_put(func_np);
+				of_node_put(cfg_np);
 				return ERR_PTR(ret);
+			}
 			if (ret > 0) {
 				++func;
 				++func_cnt;
-- 
2.17.1

