linux-kernel - [PATCH] pinctrl: rzn1: Add of_node

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Date:   Sun,  4 Aug 2019 21:10:29 +0530
From:   Nishka Dasgupta <nishkadg.linux@...il.com>
To:     geert+renesas@...der.be, linus.walleij@...aro.org,
        linux-renesas-soc@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Nishka Dasgupta <nishkadg.linux@...il.com>
Subject: [PATCH] pinctrl: rzn1: Add of_node_put() before return

Each iteration of for_each_child_of_node puts the previous node, but in
the case of a return from the middle of the loop, there is no put, thus
causing a memory leak. Hence add an of_node_put before the return in
three places.
Issue found with Coccinelle.

Signed-off-by: Nishka Dasgupta <nishkadg.linux@...il.com>
---
 drivers/pinctrl/pinctrl-rzn1.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/pinctrl/pinctrl-rzn1.c b/drivers/pinctrl/pinctrl-rzn1.c
index cc0e5aa9128a..0f6f8a10a53a 100644
--- a/drivers/pinctrl/pinctrl-rzn1.c
+++ b/drivers/pinctrl/pinctrl-rzn1.c
@@ -412,8 +412,10 @@ static int rzn1_dt_node_to_map(struct pinctrl_dev *pctldev,
 
 	for_each_child_of_node(np, child) {
 		ret = rzn1_dt_node_to_map_one(pctldev, child, map, num_maps);
-		if (ret < 0)
+		if (ret < 0) {
+			of_node_put(child);
 			return ret;
+		}
 	}
 
 	return 0;
@@ -792,8 +794,10 @@ static int rzn1_pinctrl_parse_functions(struct device_node *np,
 		grp = &ipctl->groups[ipctl->ngroups];
 		grp->func = func->name;
 		ret = rzn1_pinctrl_parse_groups(child, grp, ipctl);
-		if (ret < 0)
+		if (ret < 0) {
+			of_node_put(child);
 			return ret;
+		}
 		i++;
 		ipctl->ngroups++;
 	}
@@ -838,8 +842,10 @@ static int rzn1_pinctrl_probe_dt(struct platform_device *pdev,
 
 	for_each_child_of_node(np, child) {
 		ret = rzn1_pinctrl_parse_functions(child, ipctl, i++);
-		if (ret < 0)
+		if (ret < 0) {
+			of_node_put(child);
 			return ret;
+		}
 	}
 
 	return 0;
-- 
2.19.1