netdev - Re: [PATCH net-next v2 05/22] ovpn: implement interface creation/destruction via netlink

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Message-ID: <20240305145147.GI2357@kernel.org>
Date: Tue, 5 Mar 2024 14:51:47 +0000
From: Simon Horman <horms@...nel.org>
To: Antonio Quartulli <antonio@...nvpn.net>
Cc: netdev@...r.kernel.org, Jakub Kicinski <kuba@...nel.org>,
	Sergey Ryazanov <ryazanov.s.a@...il.com>,
	Paolo Abeni <pabeni@...hat.com>, Eric Dumazet <edumazet@...gle.com>
Subject: Re: [PATCH net-next v2 05/22] ovpn: implement interface
 creation/destruction via netlink

On Mon, Mar 04, 2024 at 04:08:56PM +0100, Antonio Quartulli wrote:
> Allow userspace to create and destroy an interface using netlink
> commands.
> 
> Signed-off-by: Antonio Quartulli <antonio@...nvpn.net>
> ---
>  drivers/net/ovpn/netlink.c | 50 ++++++++++++++++++++++++++++++++++++++
>  1 file changed, 50 insertions(+)
> 
> diff --git a/drivers/net/ovpn/netlink.c b/drivers/net/ovpn/netlink.c
> index 2e855ce145e7..02b41034f615 100644
> --- a/drivers/net/ovpn/netlink.c
> +++ b/drivers/net/ovpn/netlink.c
> @@ -154,7 +154,57 @@ static void ovpn_post_doit(const struct genl_split_ops *ops, struct sk_buff *skb
>  		dev_put(ovpn->dev);
>  }
>  
> +static int ovpn_nl_new_iface(struct sk_buff *skb, struct genl_info *info)
> +{
> +	enum ovpn_mode mode = OVPN_MODE_P2P;
> +	struct net_device *dev;
> +	char *ifname;
> +	int ret;
> +
> +	if (!info->attrs[OVPN_A_IFNAME])
> +		return -EINVAL;
> +
> +	ifname = nla_data(info->attrs[OVPN_A_IFNAME]);
> +
> +	if (info->attrs[OVPN_A_MODE]) {
> +		mode = nla_get_u8(info->attrs[OVPN_A_MODE]);
> +		netdev_dbg(dev, "%s: setting device (%s) mode: %u\n", __func__, ifname,
> +			   mode);

nit: dev is uninitialised here.

> +	}
> +
> +	ret = ovpn_iface_create(ifname, mode, genl_info_net(info));
> +	if (ret < 0)
> +		netdev_dbg(dev, "error while creating interface %s: %d\n", ifname, ret);

And here.

Flagged by Smatch.

> +
> +	return ret;
> +}

...