netdev - Re: [PATCH net] net: sit: unregister_netdevice on newlink's error path

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Date:   Thu, 14 Jan 2021 09:49:48 +0100
From:   Nicolas Dichtel <nicolas.dichtel@...nd.com>
To:     Jakub Kicinski <kuba@...nel.org>, davem@...emloft.net
Cc:     netdev@...r.kernel.org,
        syzbot+2393580080a2da190f04@...kaller.appspotmail.com
Subject: Re: [PATCH net] net: sit: unregister_netdevice on newlink's error
 path

Le 14/01/2021 à 02:29, Jakub Kicinski a écrit :
[snip]
> --- a/net/ipv6/sit.c
> +++ b/net/ipv6/sit.c
> @@ -1645,8 +1645,11 @@ static int ipip6_newlink(struct net *src_net, struct net_device *dev,
>  	}
>  
>  #ifdef CONFIG_IPV6_SIT_6RD
> -	if (ipip6_netlink_6rd_parms(data, &ip6rd))
> +	if (ipip6_netlink_6rd_parms(data, &ip6rd)) {
>  		err = ipip6_tunnel_update_6rd(nt, &ip6rd);
> +		if (err)
nit: I would prefer 'if (err < 0)' to be consistent with the rest of the sit
code, but it's purely aesthetic (ipip6_tunnel_update_6rd() returns a negative
value or 0).

With or without this:
Acked-by: Nicolas Dichtel <nicolas.dichtel@...nd.com>

> +			unregister_netdevice_queue(dev, NULL);
> +	}
>  #endif
>  
>  	return err;
>