[PATCH] pinctrl: rza1: Add of_node_put() before return

[PATCH] pinctrl: rza1: Add of_node_put() before return

[Nishka Dasgupta]

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@gmail.com>
---
 drivers/pinctrl/pinctrl-rza1.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/pinctrl/pinctrl-rza1.c b/drivers/pinctrl/pinctrl-rza1.c
index 021e37b7689e..8eeb9545137b 100644
--- a/drivers/pinctrl/pinctrl-rza1.c
+++ b/drivers/pinctrl/pinctrl-rza1.c
@@ -866,8 +866,10 @@ static int rza1_dt_node_pin_count(struct device_node *np)
 	npins = 0;
 	for_each_child_of_node(np, child) {
 		of_pins = of_find_property(child, "pinmux", NULL);
-		if (!of_pins)
+		if (!of_pins) {
+			of_node_put(child);
 			return -EINVAL;
+		}
 
 		npins += of_pins->length / sizeof(u32);
 	}
@@ -1025,8 +1027,10 @@ static int rza1_dt_node_to_map(struct pinctrl_dev *pctldev,
 		for_each_child_of_node(np, child) {
 			ret = rza1_parse_pinmux_node(rza1_pctl, child, mux_conf,
 						     grpin);
-			if (ret < 0)
+			if (ret < 0) {
+				of_node_put(child);
 				return ret;
+			}
 
 			grpin += ret;
 			mux_conf += ret;
@@ -1272,8 +1276,10 @@ static int rza1_gpio_register(struct rza1_pinctrl *rza1_pctl)
 
 		ret = rza1_parse_gpiochip(rza1_pctl, child, &gpio_chips[i],
 					  &gpio_ranges[i]);
-		if (ret)
+		if (ret) {
+			of_node_put(child);
 			return ret;
+		}
 
 		++i;
 	}
-- 
2.19.1

Re: [PATCH] pinctrl: rza1: Add of_node_put() before return

[Geert Uytterhoeven]

CC Jacopo, Chris

On Thu, Aug 15, 2019 at 8:05 AM Nishka Dasgupta
<nishkadg.linux@gmail.com> wrote:
> 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@gmail.com>

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
i.e. will queue in sh-pfc-for-v5.4.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds