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

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Message-ID: <20170515120120.GA13122@bistromath.localdomain>
Date:   Mon, 15 May 2017 14:01:20 +0200
From:   Sabrina Dubroca <sd@...asysnail.net>
To:     Tobias Jungel <tobias.jungel@...dn.de>
Cc:     Stephen Hemminger <stephen@...workplumber.org>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH] bridge: netlink: check vlan_default_pvid range

Hi Tobias,

2017-05-15, 13:08:19 +0200, 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 checks the passed pvid and
> disables the pvid in case it is out of bounds.

Could we return an error (-EINVAL) to userspace instead?  Silently
disabling the feature seems confusing to me.  This would probably be
better in br_validate() (like the IFLA_BR_VLAN_PROTOCOL check), since
there's already such a check when setting default_pvid from sysfs (in
br_vlan_set_default_pvid()).

> 
> 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

You'll also need to add a Signed-off-by, and a Fixes tag would be nice.


Thanks,

-- 
Sabrina