linux-kernel - Re: [PATCH 5.4 01/32] net: dsa: bcm_sf2: put device node before return

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Date:   Sun, 7 Feb 2021 10:25:27 +0100
From:   Pavel Machek <pavel@....cz>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Pan Bian <bianpan2016@....com>,
        Jakub Kicinski <kuba@...nel.org>
Subject: Re: [PATCH 5.4 01/32] net: dsa: bcm_sf2: put device node before
 return

Hi!

> From: Pan Bian <bianpan2016@....com>
> 
> commit cf3c46631e1637582f517a574c77cd6c05793817 upstream.
> 
> Put the device node dn before return error code on failure path.

This fixes one resource leak, but exposes next one: get_device() is
not undone in the second error path and in the end of function.

Best regards,
							Pavel

> +++ b/drivers/net/dsa/bcm_sf2.c
> @@ -421,15 +421,19 @@ static int bcm_sf2_mdio_register(struct
>  	/* Find our integrated MDIO bus node */
>  	dn = of_find_compatible_node(NULL, NULL, "brcm,unimac-mdio");
>  	priv->master_mii_bus = of_mdio_find_bus(dn);
> -	if (!priv->master_mii_bus)
> +	if (!priv->master_mii_bus) {
> +		of_node_put(dn);
>  		return -EPROBE_DEFER;
> +	}
>  
>  	get_device(&priv->master_mii_bus->dev);
>  	priv->master_mii_dn = dn;
>  
>  	priv->slave_mii_bus = devm_mdiobus_alloc(ds->dev);
> -	if (!priv->slave_mii_bus)
> +	if (!priv->slave_mii_bus) {
> +		of_node_put(dn);
>  		return -ENOMEM;
> +	}
>  
>  	priv->slave_mii_bus->priv = priv;
>  	priv->slave_mii_bus->name = "sf2 slave mii";
> 

-- 
http://www.livejournal.com/~pavelmachek

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