linux-kernel - Re: [PATCH] net: mdiobus: Fix memory leak in __mdiobus

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Message-ID: <20210928105943.GL2083@kadam>
Date:   Tue, 28 Sep 2021 13:59:43 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Pavel Skripkin <paskripkin@...il.com>
Cc:     Yanfei Xu <yanfei.xu@...driver.com>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        andrew@...n.ch, hkallweit1@...il.com, linux@...linux.org.uk,
        davem@...emloft.net, kuba@...nel.org, p.zabel@...gutronix.de,
        syzbot+398e7dc692ddbbb4cfec@...kaller.appspotmail.com,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        Dongliang Mu <mudongliangabcd@...il.com>
Subject: Re: [PATCH] net: mdiobus: Fix memory leak in __mdiobus_register

On Tue, Sep 28, 2021 at 01:46:56PM +0300, Pavel Skripkin wrote:
> > diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
> > index ee8313a4ac71..c380a30a77bc 100644
> > --- a/drivers/net/phy/mdio_bus.c
> > +++ b/drivers/net/phy/mdio_bus.c
> > @@ -538,6 +538,7 @@ int __mdiobus_register(struct mii_bus *bus, struct module *owner)
> >   	bus->dev.groups = NULL;
> >   	dev_set_name(&bus->dev, "%s", bus->id);
> > +	bus->state = MDIOBUS_UNREGISTERED;
> >   	err = device_register(&bus->dev);
> >   	if (err) {
> >   		pr_err("mii_bus %s failed to register\n", bus->id);
> > 
> > 
> yep, it's the same as mine, but I thought, that MDIOBUS_UNREGISTERED is not
> correct name for this state :) Anyway, thank you for suggestion
> 

It's not actually the same.  The state has to be set before the
device_register() or there is still a leak.

regards,
dan carpenter