[Bridge] bridge: per vlan dst_metadata netlink support

[Colin Ian King]

Hi,

Static analysis with CoverityScan on net/bridge/br_netlink_tunnel.c has
picked up and issue where tb[] is being referenced but contains
uninitialized data.

222 int br_parse_vlan_tunnel_info(struct nlattr *attr,
223                               struct vtunnel_info *tinfo)
224 {

    1. var_decl: Declaring variable tb without initializer.

225         struct nlattr *tb[IFLA_BRIDGE_VLAN_TUNNEL_MAX + 1];
226         u32 tun_id;
227         u16 vid, flags = 0;
228         int err;
229
230         memset(tinfo, 0, sizeof(*tinfo));
231

    CID 1400055 (#1 of 1): Uninitialized pointer read (UNINIT)2.
uninit_use: Using uninitialized value tb[IFLA_BRIDGE_VLAN_TUNNEL_ID].

232         if (!tb[IFLA_BRIDGE_VLAN_TUNNEL_ID] ||
233             !tb[IFLA_BRIDGE_VLAN_TUNNEL_VID])
234                 return -EINVAL;

Colin