netdev - [PATCH net-next v21 4/4] openvswitch: report error on VLAN nlattr in ovs_key_from

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Message-Id: <1472762727-25844-5-git-send-email-e@erig.me>
Date:   Thu,  1 Sep 2016 16:45:27 -0400
From:   Eric Garver <e@...g.me>
To:     netdev@...r.kernel.org
Cc:     dev@...nvswitch.org, Thomas F Herbert <thomasfherbert@...il.com>,
        Xiao Liang <shaw.leon@...il.com>
Subject: [PATCH net-next v21 4/4] openvswitch: report error on VLAN nlattr in ovs_key_from_nlattrs()

With 802.1ad support these are parsed and set upfront by
parse_vlan_from_nlattrs() before ovs_key_from_nlattrs() is ever called.
As such we should never see a VLAN attribute in ovs_key_from_nlattrs().

Signed-off-by: Eric Garver <e@...g.me>
---
 net/openvswitch/flow_netlink.c | 19 +++++--------------
 1 file changed, 5 insertions(+), 14 deletions(-)

diff --git a/net/openvswitch/flow_netlink.c b/net/openvswitch/flow_netlink.c
index fbe9e0e4792d..0f36aead744b 100644
--- a/net/openvswitch/flow_netlink.c
+++ b/net/openvswitch/flow_netlink.c
@@ -923,20 +923,11 @@ static int ovs_key_from_nlattrs(struct net *net, struct sw_flow_match *match,
 	}
 
 	if (attrs & (1 << OVS_KEY_ATTR_VLAN)) {
-		__be16 tci;
-
-		tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
-		if (!(tci & htons(VLAN_TAG_PRESENT))) {
-			if (is_mask)
-				OVS_NLERR(log, "VLAN TCI mask does not have exact match for VLAN_TAG_PRESENT bit.");
-			else
-				OVS_NLERR(log, "VLAN TCI does not have VLAN_TAG_PRESENT bit set.");
-
-			return -EINVAL;
-		}
-
-		SW_FLOW_KEY_PUT(match, eth.vlan.tci, tci, is_mask);
-		attrs &= ~(1 << OVS_KEY_ATTR_VLAN);
+		/* VLAN attribute is always parsed before getting here since it may
+		 * occur multiple times.
+		 */
+		OVS_NLERR(log, "VLAN attribute unexpected.");
+		return -EINVAL;
 	}
 
 	if (attrs & (1 << OVS_KEY_ATTR_ETHERTYPE)) {
-- 
2.5.5