netdev - [PATCH v2] bridge: netlink: check vlan_default

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Date:   Mon, 15 May 2017 15:23:40 +0200
From:   Tobias Jungel <tobias.jungel@...dn.de>
To:     Sabrina Dubroca <sd@...asysnail.net>,
        Nikolay Aleksandrov <nikolay@...ulusnetworks.com>,
        Stephen Hemminger <stephen@...workplumber.org>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: [PATCH v2] bridge: netlink: check vlan_default_pvid range

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
returns an 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_vlan.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/bridge/br_vlan.c b/net/bridge/br_vlan.c
index b838213..95a565e 100644
--- a/net/bridge/br_vlan.c
+++ b/net/bridge/br_vlan.c
@@ -825,6 +825,9 @@ int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid)
 		return 0;
 	}
 
+	if (pvid >= VLAN_VID_MASK)
+		return -EINVAL;
+
 	changed = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long),
 			  GFP_KERNEL);
 	if (!changed)
-- 
2.9.4