IB/ipoib: Verify address handle validity on send

When the bonding device senses a carrier loss of its active slave it replaces
that slave with a new one. In between the times when the carrier of an IPoIB
device goes down and ipoib_neigh is destroyed, it is possible that the
bonding driver will send a packet on a new slave that uses an old ipoib_neigh.
This patch detects and prevents this from happenning.

Signed-off-by: Moni Shoua <monis at voltaire.com>
Signed-off-by: Or Gerlitz <ogerlitz at voltaire.com>
Acked-by: Roland Dreier <rdreier@cisco.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c
index cae026c4eb..362610d870 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_main.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c
@@ -692,9 +692,10 @@ static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
                                 goto out;
                         }
                 } else if (neigh->ah) {
-                        if (unlikely(memcmp(&neigh->dgid.raw,
+                        if (unlikely((memcmp(&neigh->dgid.raw,
                                             skb->dst->neighbour->ha + 4,
-                                            sizeof(union ib_gid)))) {
+                                            sizeof(union ib_gid))) ||
+                                         (neigh->dev != dev))) {
                                 spin_lock(&priv->lock);
                                 /*
                                  * It's safe to call ipoib_put_ah() inside