linux-kernel - [PATCH 3.16 400/410] bonding: fix the err path for dev hwaddr sync in bond

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Date:   Thu, 07 Jun 2018 15:05:21 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "David S. Miller" <davem@...emloft.net>,
        "Nikolay Aleksandrov" <nikolay@...ulusnetworks.com>,
        "Xin Long" <lucien.xin@...il.com>,
        "Andy Gospodarek" <andy@...yhouse.net>
Subject: [PATCH 3.16 400/410] bonding: fix the err path for dev hwaddr
 sync in bond_enslave

3.16.57-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Xin Long <lucien.xin@...il.com>

commit 5c78f6bfae2b10ff70e21d343e64584ea6280c26 upstream.

vlan_vids_add_by_dev is called right after dev hwaddr sync, so on
the err path it should unsync dev hwaddr. Otherwise, the slave
dev's hwaddr will never be unsync when this err happens.

Fixes: 1ff412ad7714 ("bonding: change the bond's vlan syncing functions with the standard ones")
Signed-off-by: Xin Long <lucien.xin@...il.com>
Reviewed-by: Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
Acked-by: Andy Gospodarek <andy@...yhouse.net>
Signed-off-by: David S. Miller <davem@...emloft.net>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/net/bonding/bond_main.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -1451,7 +1451,7 @@ int bond_enslave(struct net_device *bond
 	if (res) {
 		pr_err("%s: Error: Couldn't add bond vlan ids to %s\n",
 		       bond_dev->name, slave_dev->name);
-		goto err_close;
+		goto err_hwaddr_unsync;
 	}
 
 	prev_slave = bond_last_slave(bond);
@@ -1626,9 +1626,6 @@ err_unregister:
 	netdev_rx_handler_unregister(slave_dev);
 
 err_detach:
-	if (!bond_uses_primary(bond))
-		bond_hw_addr_flush(bond_dev, slave_dev);
-
 	vlan_vids_del_by_dev(slave_dev, bond_dev);
 	if (bond->primary_slave == new_slave)
 		bond->primary_slave = NULL;
@@ -1642,6 +1639,10 @@ err_detach:
 	}
 	slave_disable_netpoll(new_slave);
 
+err_hwaddr_unsync:
+	if (!bond_uses_primary(bond))
+		bond_hw_addr_flush(bond_dev, slave_dev);
+
 err_close:
 	slave_dev->priv_flags &= ~IFF_BONDING;
 	dev_close(slave_dev);