linux-kernel - [PATCH 4.15 142/168] bonding: process the err returned by dev_set_allmulti properly in bond

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Date:   Wed, 11 Apr 2018 00:24:44 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Xin Long <lucien.xin@...il.com>,
        Andy Gospodarek <andy@...yhouse.net>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.15 142/168] bonding: process the err returned by dev_set_allmulti properly in bond_enslave

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

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

From: Xin Long <lucien.xin@...il.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.xin@...il.com>
Acked-by: Andy Gospodarek <andy@...yhouse.net>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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
@@ -1706,8 +1706,11 @@ 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);