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

[PATCH] pinctrl: st: 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-st.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/pinctrl/pinctrl-st.c b/drivers/pinctrl/pinctrl-st.c
index b9688ea548da..e788c7495ec7 100644
--- a/drivers/pinctrl/pinctrl-st.c
+++ b/drivers/pinctrl/pinctrl-st.c
@@ -1262,8 +1262,10 @@ static int st_pctl_parse_functions(struct device_node *np,
 		grp = &info->groups[*grp_index];
 		*grp_index += 1;
 		ret = st_pctl_dt_parse_groups(child, grp, info, i++);
-		if (ret)
+		if (ret) {
+			of_node_put(child);
 			return ret;
+		}
 	}
 	dev_info(info->dev, "Function[%d\t name:%s,\tgroups:%d]\n",
 				index, func->name, func->ngroups);
@@ -1623,8 +1625,10 @@ static int st_pctl_probe_dt(struct platform_device *pdev,
 		if (of_property_read_bool(child, "gpio-controller")) {
 			const char *bank_name = NULL;
 			ret = st_gpiolib_register_bank(info, bank, child);
-			if (ret)
+			if (ret) {
+				of_node_put(child);
 				return ret;
+			}
 
 			k = info->banks[bank].range.pin_base;
 			bank_name = info->banks[bank].range.name;
@@ -1641,6 +1645,7 @@ static int st_pctl_probe_dt(struct platform_device *pdev,
 							i++, &grp_index);
 			if (ret) {
 				dev_err(&pdev->dev, "No functions found.\n");
+				of_node_put(child);
 				return ret;
 			}
 		}
-- 
2.19.1

[PATCH] pinctrl: st: 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-st.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/pinctrl/pinctrl-st.c b/drivers/pinctrl/pinctrl-st.c
index b9688ea548da..e788c7495ec7 100644
--- a/drivers/pinctrl/pinctrl-st.c
+++ b/drivers/pinctrl/pinctrl-st.c
@@ -1262,8 +1262,10 @@ static int st_pctl_parse_functions(struct device_node *np,
 		grp = &info->groups[*grp_index];
 		*grp_index += 1;
 		ret = st_pctl_dt_parse_groups(child, grp, info, i++);
-		if (ret)
+		if (ret) {
+			of_node_put(child);
 			return ret;
+		}
 	}
 	dev_info(info->dev, "Function[%d\t name:%s,\tgroups:%d]\n",
 				index, func->name, func->ngroups);
@@ -1623,8 +1625,10 @@ static int st_pctl_probe_dt(struct platform_device *pdev,
 		if (of_property_read_bool(child, "gpio-controller")) {
 			const char *bank_name = NULL;
 			ret = st_gpiolib_register_bank(info, bank, child);
-			if (ret)
+			if (ret) {
+				of_node_put(child);
 				return ret;
+			}
 
 			k = info->banks[bank].range.pin_base;
 			bank_name = info->banks[bank].range.name;
@@ -1641,6 +1645,7 @@ static int st_pctl_probe_dt(struct platform_device *pdev,
 							i++, &grp_index);
 			if (ret) {
 				dev_err(&pdev->dev, "No functions found.\n");
+				of_node_put(child);
 				return ret;
 			}
 		}
-- 
2.19.1


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

[Linus Walleij]

On Thu, Aug 15, 2019 at 8:06 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>

Patch applied.

Yours,
Linus Walleij

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

[Linus Walleij]

On Thu, Aug 15, 2019 at 8:06 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>

Patch applied.

Yours,
Linus Walleij

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