netdev - Re: [PATCH net] net: fix a leak in register

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Date:   Tue, 03 Dec 2019 14:42:23 +0100
From:   walter harms <wharms@....de>
To:     Dan Carpenter <dan.carpenter@...cle.com>
CC:     "David S. Miller" <davem@...emloft.net>,
        Jiri Pirko <jiri@...lanox.com>,
        Ido Schimmel <idosch@...lanox.com>,
        Petr Machata <petrm@...lanox.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Taehee Yoo <ap420073@...il.com>,
        Stephen Hemminger <stephen@...workplumber.org>,
        Alexander Lobakin <alobakin@...nk.ru>, netdev@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH net] net: fix a leak in register_netdevice()



Am 03.12.2019 14:00, schrieb Dan Carpenter:
> We have to free "dev->name_node" on this error path.
> 
> Fixes: ff92741270bf ("net: introduce name_node struct to be used in hashlist")
> Reported-by: syzbot+6e13e65ffbaa33757bcb@...kaller.appspotmail.com
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
> ---
>  net/core/dev.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/net/core/dev.c b/net/core/dev.c
> index d75fd04d4e2c..9cc4b193d8c4 100644
> --- a/net/core/dev.c
> +++ b/net/core/dev.c
> @@ -9246,7 +9246,7 @@ int register_netdevice(struct net_device *dev)
>  		if (ret) {
>  			if (ret > 0)
>  				ret = -EIO;
> -			goto out;
> +			goto err_free_name;
>  		}
>  	}
>  
> @@ -9361,12 +9361,13 @@ int register_netdevice(struct net_device *dev)
>  	return ret;
>  
>  err_uninit:
> -	if (dev->name_node)
> -		netdev_name_node_free(dev->name_node);
>  	if (dev->netdev_ops->ndo_uninit)
>  		dev->netdev_ops->ndo_uninit(dev);
>  	if (dev->priv_destructor)
>  		dev->priv_destructor(dev);
> +err_free_name:
> +	if (dev->name_node)
> +		netdev_name_node_free(dev->name_node);
>  	goto out;
>  }
>  EXPORT_SYMBOL(register_netdevice);

nitpick:
netdev_name_node_free() is a wrapper for kfree().
no need to check dev->name_node.

jm2c

re,
 wh