linux-kernel - Re: [PATCH v2] drivers: soc: atmel: Fix refcount leak in atmel_soc_device

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Date:   Tue, 7 Jun 2022 05:01:44 +0000
From:   <Claudiu.Beznea@...rochip.com>
To:     <linmq006@...il.com>, <Nicolas.Ferre@...rochip.com>,
        <alexandre.belloni@...tlin.com>, <Mihai.Sain@...rochip.com>,
        <sudeep.holla@....com>, <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] drivers: soc: atmel: Fix refcount leak in
 atmel_soc_device_init

On 07.06.2022 06:00, Miaoqian Lin wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> of_find_node_by_path() returns a node pointer with refcount incremented,
> we should use of_node_put() on it when not need anymore.
> Add missing of_node_put() to avoid refcount leak.
> 
> Fixes: 960ddf70cc11 ("drivers: soc: atmel: Avoid calling at91_soc_init on non AT91 SoCs")
> Signed-off-by: Miaoqian Lin <linmq006@...il.com>

Reviewed-by: Claudiu Beznea <claudiu.beznea@...rochip.com>


> ---
> changes in v2:
> - create new variable match to refactor the patch.
> 
> v1 Link: https://lore.kernel.org/r/20220605084035.27127-1-linmq006@gmail.com
> ---
>  drivers/soc/atmel/soc.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/soc/atmel/soc.c b/drivers/soc/atmel/soc.c
> index b2d365ae0282..7152a38c657a 100644
> --- a/drivers/soc/atmel/soc.c
> +++ b/drivers/soc/atmel/soc.c
> @@ -368,8 +368,11 @@ static const struct of_device_id at91_soc_allowed_list[] __initconst = {
>  static int __init atmel_soc_device_init(void)
>  {
>         struct device_node *np = of_find_node_by_path("/");
> +       const struct of_device_id *match;
> 
> -       if (!of_match_node(at91_soc_allowed_list, np))
> +       match = of_match_node(at91_soc_allowed_list, np);
> +       of_node_put(np);
> +       if (!match)
>                 return 0;
> 
>         at91_soc_init(socs);
> --
> 2.25.1
>