netdev - Re: [PATCH 1/6] bridge: add support to parse multiple vlan info attributes in IFLA_AF

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Date:	Mon, 29 Dec 2014 13:40:37 -0800
From:	Scott Feldman <sfeldma@...il.com>
To:	Roopa Prabhu <roopa@...ulusnetworks.com>
Cc:	Netdev <netdev@...r.kernel.org>, shemminger@...tta.com,
	"vyasevic@...hat.com" <vyasevic@...hat.com>
Subject: Re: [PATCH 1/6] bridge: add support to parse multiple vlan info
 attributes in IFLA_AF_SPEC

On Mon, Dec 29, 2014 at 1:05 PM,  <roopa@...ulusnetworks.com> wrote:
> From: Roopa Prabhu <roopa@...ulusnetworks.com>
>
> This patch changes bridge IFLA_AF_SPEC netlink attribute parser to
> look for more than one IFLA_BRIDGE_VLAN_INFO attribute. This allows
> userspace to pack more than one vlan in the setlink msg.
>
> Signed-off-by: Roopa Prabhu <roopa@...ulusnetworks.com>
> ---
>  net/bridge/br_netlink.c |   18 +++++++++---------
>  1 file changed, 9 insertions(+), 9 deletions(-)
>
> diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
> index 9f5eb55..75971b1 100644
> --- a/net/bridge/br_netlink.c
> +++ b/net/bridge/br_netlink.c
> @@ -230,18 +230,18 @@ static int br_afspec(struct net_bridge *br,
>                      struct nlattr *af_spec,
>                      int cmd)
>  {
> -       struct nlattr *tb[IFLA_BRIDGE_MAX+1];
> +       struct bridge_vlan_info *vinfo;
>         int err = 0;
> +       struct nlattr *attr;
> +       int err = 0;
> +       int rem;
> +       u16 vid;
>
> -       err = nla_parse_nested(tb, IFLA_BRIDGE_MAX, af_spec, ifla_br_policy);

Removing this call orphans ifla_br_policy...should ifla_br_policy be removed?

> -       if (err)
> -               return err;
> -
> -       if (tb[IFLA_BRIDGE_VLAN_INFO]) {
> -               struct bridge_vlan_info *vinfo;
> -
> -               vinfo = nla_data(tb[IFLA_BRIDGE_VLAN_INFO]);
> +       nla_for_each_nested(attr, af_spec, rem) {
> +               if (nla_type(attr) != IFLA_BRIDGE_VLAN_INFO)
> +                       continue;

Need to validate size of attr is sizeof(struct bridge_vlan_info).

>
> +               vinfo = nla_data(attr);
>                 if (!vinfo->vid || vinfo->vid >= VLAN_VID_MASK)
>                         return -EINVAL;
>
> --
> 1.7.10.4
>
> --
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