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

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Date:   Thu, 30 Sep 2021 00:31:30 +0300
From:   Denis Efremov <denis.e.efremov@...cle.com>
To:     Yanfei Xu <yanfei.xu@...driver.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,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Pavel Skripkin <paskripkin@...il.com>
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] net: mdiobus: Fix memory leak in __mdiobus_register

Hi,

Just want to note that highly likely this patch reintroduces
CVE-2019-12819 that was fixed in commit
6ff7b060535e ("mdio_bus: Fix use-after-free on device_register fails")
and added by the same patch in commit
0c692d07842a ("drivers/net/phy/mdio_bus.c: call put_device on device_register() failure")

>  drivers/net/phy/mdio_bus.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
> index 53f034fc2ef7..6f4b4e5df639 100644
> --- a/drivers/net/phy/mdio_bus.c
> +++ b/drivers/net/phy/mdio_bus.c
> @@ -537,6 +537,7 @@ int __mdiobus_register(struct mii_bus *bus, struct module *owner)
>  	err = device_register(&bus->dev);
>  	if (err) {
>  		pr_err("mii_bus %s failed to register\n", bus->id);
> +		put_device(&bus->dev);
>  		return -EINVAL;
>  	}


Thanks,
Denis