[PATCH] pinctrl: freescale: mxs: Add of_node_put() before return

[PATCH] pinctrl: freescale: mxs: 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/freescale/pinctrl-mxs.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/pinctrl/freescale/pinctrl-mxs.c b/drivers/pinctrl/freescale/pinctrl-mxs.c
index 641b3088876f..735cedd0958a 100644
--- a/drivers/pinctrl/freescale/pinctrl-mxs.c
+++ b/drivers/pinctrl/freescale/pinctrl-mxs.c
@@ -488,8 +488,10 @@ static int mxs_pinctrl_probe_dt(struct platform_device *pdev,
 		if (of_property_read_u32(child, "reg", &val)) {
 			ret = mxs_pinctrl_parse_group(pdev, child,
 						      idxg++, NULL);
-			if (ret)
+			if (ret) {
+				of_node_put(child);
 				return ret;
+			}
 			continue;
 		}
 
@@ -499,15 +501,19 @@ static int mxs_pinctrl_probe_dt(struct platform_device *pdev,
 						 f->ngroups,
 						 sizeof(*f->groups),
 						 GFP_KERNEL);
-			if (!f->groups)
+			if (!f->groups) {
+				of_node_put(child);
 				return -ENOMEM;
+			}
 			fn = child->name;
 			i = 0;
 		}
 		ret = mxs_pinctrl_parse_group(pdev, child, idxg++,
 					      &f->groups[i++]);
-		if (ret)
+		if (ret) {
+			of_node_put(child);
 			return ret;
+		}
 	}
 
 	return 0;
-- 
2.19.1

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

[Linus Walleij]

On Sun, Aug 4, 2019 at 6:04 PM 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