netdev - [PATCH net 3/3] bonding: process the err returned by dev_set_allmulti properly in bond

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Message-Id: <5695ce418ff6d7a2755053d6c7c35dfd3ebf2d6b.1521997984.git.lucien.xin@gmail.com>
Date:   Mon, 26 Mar 2018 01:16:47 +0800
From:   Xin Long <lucien.xin@...il.com>
To:     network dev <netdev@...r.kernel.org>
Cc:     davem@...emloft.net, Jiri Pirko <jiri@...nulli.us>,
        Wang Chen <wangchen@...fujitsu.com>,
        Veaceslav Falico <vfalico@...hat.com>,
        Nikolay Aleksandrov <nikolay@...hat.com>
Subject: [PATCH net 3/3] bonding: process the err returned by dev_set_allmulti properly in bond_enslave

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@...il.com>
---
 drivers/net/bonding/bond_main.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 55e1985..b7b1130 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -1706,8 +1706,11 @@ 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);
-			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);
-- 
2.1.0