[PATCH] bridge: netlink: check vlan_default_pvid range

[Tobias Jungel]

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.

Reproduce by calling:

[root@test ~]# ip l a type bridge
[root@test ~]# ip l a type dummy
[root@test ~]# ip l s bridge0 type bridge vlan_filtering 1
[root@test ~]# ip l s bridge0 type bridge vlan_default_pvid 9999
[root@test ~]# ip l s dummy0 master bridge0
[root@test ~]# bridge vlan
port    vlan ids
bridge0  9999 PVID Egress Untagged

dummy0   9999 PVID Egress Untagged
---
 net/bridge/br_vlan.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/bridge/br_vlan.c b/net/bridge/br_vlan.c
index b838213..e363d75 100644
--- a/net/bridge/br_vlan.c
+++ b/net/bridge/br_vlan.c
@@ -820,7 +820,7 @@ int __br_vlan_set_default_pvid(struct net_bridge *br, u16 
pvid)
        int err = 0;
        unsigned long *changed;
 
-       if (!pvid) {
+       if (!pvid || pvid >= VLAN_VID_MASK) {
                br_vlan_disable_default_pvid(br);
                return 0;
        }
-- 
2.9.4