openvswitch: Validate IPv6 flow key and mask values.

Reject flow label key and mask values with invalid bits set.
Introduced by commit 3fdbd1ce11e5 ("openvswitch: add ipv6 'set'
action").

Signed-off-by: Jarno Rajahalme <jrajahalme@nicira.com>
Acked-by: Jesse Gross <jesse@nicira.com>
Signed-off-by: Pravin B Shelar <pshelar@nicira.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/net/openvswitch/flow_netlink.c b/net/openvswitch/flow_netlink.c
index dda040e693a3..fa4ec2e4a78b 100644
--- a/net/openvswitch/flow_netlink.c
+++ b/net/openvswitch/flow_netlink.c
@@ -689,6 +689,13 @@ static int ovs_key_from_nlattrs(struct sw_flow_match *match, u64 attrs,
                                 ipv6_key->ipv6_frag, OVS_FRAG_TYPE_MAX);
                         return -EINVAL;
                 }
+
+                if (ipv6_key->ipv6_label & htonl(0xFFF00000)) {
+                        OVS_NLERR("IPv6 flow label %x is out of range (max=%x).\n",
+                                  ntohl(ipv6_key->ipv6_label), (1 << 20) - 1);
+                        return -EINVAL;
+                }
+
                 SW_FLOW_KEY_PUT(match, ipv6.label,
                                 ipv6_key->ipv6_label, is_mask);
                 SW_FLOW_KEY_PUT(match, ip.proto,