[PATCH] pinctrl: stm32: stm32: Add of_node_put() before return

[PATCH] pinctrl: stm32: stm32: Add of_node_put() before return

[Nishka Dasgupta]

Each iteration of for_each_child_of_node and
for_each_available_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
two places.
Issue found with Coccinelle.

Signed-off-by: Nishka Dasgupta <nishkadg.linux@gmail.com>
---
 drivers/pinctrl/stm32/pinctrl-stm32.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/pinctrl/stm32/pinctrl-stm32.c b/drivers/pinctrl/stm32/pinctrl-stm32.c
index b453aed1bbeb..2d5e0435af0a 100644
--- a/drivers/pinctrl/stm32/pinctrl-stm32.c
+++ b/drivers/pinctrl/stm32/pinctrl-stm32.c
@@ -615,6 +615,7 @@ static int stm32_pctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
 				&reserved_maps, num_maps);
 		if (ret < 0) {
 			pinctrl_utils_free_map(pctldev, *map, *num_maps);
+			of_node_put(np);
 			return ret;
 		}
 	}
@@ -1468,8 +1469,10 @@ int stm32_pctl_probe(struct platform_device *pdev)
 	for_each_available_child_of_node(np, child) {
 		if (of_property_read_bool(child, "gpio-controller")) {
 			ret = stm32_gpiolib_register_bank(pctl, child);
-			if (ret)
+			if (ret) {
+				of_node_put(child);
 				return ret;
+			}
 
 			pctl->nbanks++;
 		}
-- 
2.19.1

Re: [PATCH] pinctrl: stm32: stm32: Add of_node_put() before return

[Linus Walleij]

On Thu, Aug 8, 2019 at 9:55 AM Nishka Dasgupta <nishkadg.linux@gmail.com> wrote:

> Each iteration of for_each_child_of_node and
> for_each_available_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
> two places.
> Issue found with Coccinelle.
>
> Signed-off-by: Nishka Dasgupta <nishkadg.linux@gmail.com>

Patch applied.

Yours,
Linus Walleij