bonding: process the err returned by dev_set_allmulti properly in bond_enslave

commit 9f5a90c107741b864398f4ac0014711a8c1d8474 upstream.

When dev_set_promiscuity(1) succeeds but dev_set_allmulti(1) fails,
dev_set_promiscuity(-1) should be done before going to the err path.
Otherwise, dev->promiscuity will leak.

Fixes: 7e1a1ac1fbaa ("bonding: Check return of dev_set_promiscuity/allmulti")
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Andy Gospodarek <andy@greyhouse.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 9145834..18ebffa 100644 (file)
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -1704,8 +1704,11 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
                /* set allmulti level to new slave */
                if (bond_dev->flags & IFF_ALLMULTI) {
                        res = dev_set_allmulti(slave_dev, 1);
                /* set allmulti level to new slave */
                if (bond_dev->flags & IFF_ALLMULTI) {
                        res = dev_set_allmulti(slave_dev, 1);

-                       if (res)
+                       if (res) {
+                               if (bond_dev->flags & IFF_PROMISC)
+                                       dev_set_promiscuity(slave_dev, -1);

                                goto err_close;
                                goto err_close;

+                       }

                }
 
                netif_addr_lock_bh(bond_dev);
                }
 
                netif_addr_lock_bh(bond_dev);