gpio: sifive: Fix refcount leak in sifive_gpio_probe

[PATCH] gpio: sifive: Fix refcount leak in sifive_gpio_probe

Posted by Miaoqian Lin 2 years, 8 months ago

of_irq_find_parent() returns a node pointer with refcount incremented,
We should use of_node_put() on it when not needed anymore.
Add missing of_node_put() to avoid refcount leak.

Fixes: 96868dce644d ("gpio/sifive: Add GPIO driver for SiFive SoCs")
Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
---
 drivers/gpio/gpio-sifive.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpio/gpio-sifive.c b/drivers/gpio/gpio-sifive.c
index 238f3210970c..bc5660f61c57 100644
--- a/drivers/gpio/gpio-sifive.c
+++ b/drivers/gpio/gpio-sifive.c
@@ -215,6 +215,7 @@ static int sifive_gpio_probe(struct platform_device *pdev)
 		return -ENODEV;
 	}
 	parent = irq_find_host(irq_parent);
+	of_node_put(irq_parent);
 	if (!parent) {
 		dev_err(dev, "no IRQ parent domain\n");
 		return -ENODEV;
-- 
2.25.1

Re: [PATCH] gpio: sifive: Fix refcount leak in sifive_gpio_probe

Posted by Bartosz Golaszewski 2 years, 8 months ago

On Mon, Jan 2, 2023 at 9:20 AM Miaoqian Lin <linmq006@gmail.com> wrote:
>
> of_irq_find_parent() returns a node pointer with refcount incremented,
> We should use of_node_put() on it when not needed anymore.
> Add missing of_node_put() to avoid refcount leak.
>
> Fixes: 96868dce644d ("gpio/sifive: Add GPIO driver for SiFive SoCs")
> Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
> ---
>  drivers/gpio/gpio-sifive.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/gpio/gpio-sifive.c b/drivers/gpio/gpio-sifive.c
> index 238f3210970c..bc5660f61c57 100644
> --- a/drivers/gpio/gpio-sifive.c
> +++ b/drivers/gpio/gpio-sifive.c
> @@ -215,6 +215,7 @@ static int sifive_gpio_probe(struct platform_device *pdev)
>                 return -ENODEV;
>         }
>         parent = irq_find_host(irq_parent);
> +       of_node_put(irq_parent);
>         if (!parent) {
>                 dev_err(dev, "no IRQ parent domain\n");
>                 return -ENODEV;
> --
> 2.25.1
>

Good catch, applied!

Bart