[PATCH 4.4 179/190] bonding: process the err returned by dev_set_allmulti properly in bond_enslave

[Greg Kroah-Hartman]

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Xin Long <lucien....@gmail.com>


[ Upstream commit 9f5a90c107741b864398f4ac0014711a8c1d8474 ]

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....@gmail.com>
Acked-by: Andy Gospodarek <a...@greyhouse.net>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 drivers/net/bonding/bond_main.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -1660,8 +1660,11 @@ int bond_enslave(struct net_device *bond
                /* 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_sysfs_del;
+                       }
                }
 
                netif_addr_lock_bh(bond_dev);