netdev - Re: [PATCH v3] bridge: netlink: check vlan_default

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Date:   Tue, 16 May 2017 19:23:07 +0300
From:   Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
To:     Tobias Jungel <tobias.jungel@...dn.de>,
        Sabrina Dubroca <sd@...asysnail.net>,
        Stephen Hemminger <stephen@...workplumber.org>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH v3] bridge: netlink: check vlan_default_pvid range

On 5/16/17 11:48 AM, Tobias Jungel wrote:
> Currently it is allowed to set the default pvid of a bridge to a value
> above VLAN_VID_MASK (0xfff). This patch adds a check to br_validate and
> returns -EINVAL in case the pvid is out of bounds.
> 
> Reproduce by calling:
> 
> [root@...t ~]# ip l a type bridge
> [root@...t ~]# ip l a type dummy
> [root@...t ~]# ip l s bridge0 type bridge vlan_filtering 1
> [root@...t ~]# ip l s bridge0 type bridge vlan_default_pvid 9999
> [root@...t ~]# ip l s dummy0 master bridge0
> [root@...t ~]# bridge vlan
> port	vlan ids
> bridge0	 9999 PVID Egress Untagged
> 
> dummy0	 9999 PVID Egress Untagged
> 
> Fixes: 0f963b7592ef ("bridge: netlink: add support for default_pvid")
> Signed-off-by: Tobias Jungel <tobias.jungel@...dn.de>
> ---
>   net/bridge/br_netlink.c | 6 ++++++
>   1 file changed, 6 insertions(+)
> 
> diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
> index c5ce774..47cb95b 100644
> --- a/net/bridge/br_netlink.c
> +++ b/net/bridge/br_netlink.c
> @@ -835,6 +835,12 @@ static int br_validate(struct nlattr *tb[], struct nlattr *data[])
>   			return -EPROTONOSUPPORT;
>   		}
>   	}
> +
> +	if (data[IFLA_BR_VLAN_DEFAULT_PVID]) {
> +		__u16 defpvid = nla_get_u16(data[IFLA_BR_VLAN_DEFAULT_PVID]);

Please leave a blank line between the variable definition and the rest.

> +		if (defpvid >= VLAN_VID_MASK)
> +			return -EINVAL;
> +	}
>   #endif
>   
>   	return 0;
> 

This version looks good to me, with the above stylistic issue fixed feel
free to add my:

Acked-by: Nikolay Aleksandrov <nikolay@...ulusnetworks.com>

Thanks!