netdev - Re: [PATCH net] net: devlink: fix UAF in devlink_compat_running

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Date:   Wed, 23 Nov 2022 18:20:34 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Yang Yingliang <yangyingliang@...wei.com>
Cc:     Leon Romanovsky <leon@...nel.org>, <netdev@...r.kernel.org>,
        <jiri@...dia.com>, <davem@...emloft.net>, <edumazet@...gle.com>,
        <pabeni@...hat.com>
Subject: Re: [PATCH net] net: devlink: fix UAF in
 devlink_compat_running_version()

On Wed, 23 Nov 2022 14:40:24 +0800 Yang Yingliang wrote:
> >   	if (err)
> > -		goto err_dl_unregister;
> > +		goto err_resource_unregister;
> >   	nsim_devlink_set_params_init_values(nsim_dev, devlink);
> >   
> > +	/* here, because params API still expect devlink to be unregistered */
> > +	devl_register(devlink);
> > +  
> devlink_set_features() called at last in probe() also needs devlink is 
> not registered.

You can move the devlink_set_features() up. It's also a leftover,
it was preventing reload from happening before probe has finished.
Now the instance is locked until probe is done so there is no race.