linux-kernel - Re: [PATCH] net: dsa: mv88e6xxx: Fix refcount leak in mv88e6xxx_mdios

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Date:   Thu, 26 May 2022 13:01:02 +0200
From:   Marek Behún <kabel@...nel.org>
To:     Miaoqian Lin <linmq006@...il.com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: dsa: mv88e6xxx: Fix refcount leak in
 mv88e6xxx_mdios_register

On Thu, 26 May 2022 12:37:48 +0400
Miaoqian Lin <linmq006@...il.com> wrote:

> of_get_child_by_name() returns a node pointer with refcount
> incremented, we should use of_node_put() on it when done.
> This function missing of_node_put() in an error path.
> Add missing of_node_put() to avoid refcount leak.
> 
> Signed-off-by: Miaoqian Lin <linmq006@...il.com>
> ---
>  drivers/net/dsa/mv88e6xxx/chip.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
> index 5d2c57a7c708..0726df6aeb1f 100644
> --- a/drivers/net/dsa/mv88e6xxx/chip.c
> +++ b/drivers/net/dsa/mv88e6xxx/chip.c
> @@ -3960,8 +3960,10 @@ static int mv88e6xxx_mdios_register(struct mv88e6xxx_chip *chip,
>  	 */
>  	child = of_get_child_by_name(np, "mdio");
>  	err = mv88e6xxx_mdio_register(chip, child, false);
> -	if (err)
> +	if (err) {
> +		of_node_put(child);
>  		return err;
> +	}
>  
>  	/* Walk the device tree, and see if there are any other nodes
>  	 * which say they are compatible with the external mdio

Fix needs Fixes tag so that it can be backported. Please add correct
Fixes tag.