linux-kernel - [PATCH 4.9 07/29] bonding: ARP monitor spams NETDEV_NOTIFY

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Date:   Thu, 30 Jun 2022 15:46:07 +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, Jonathan Toppins <jtoppins@...hat.com>,
        Jay Vosburgh <jay.vosburgh@...onical.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.9 07/29] bonding: ARP monitor spams NETDEV_NOTIFY_PEERS notifiers

From: Jay Vosburgh <jay.vosburgh@...onical.com>

[ Upstream commit 7a9214f3d88cfdb099f3896e102a306b316d8707 ]

The bonding ARP monitor fails to decrement send_peer_notif, the
number of peer notifications (gratuitous ARP or ND) to be sent. This
results in a continuous series of notifications.

Correct this by decrementing the counter for each notification.

Reported-by: Jonathan Toppins <jtoppins@...hat.com>
Signed-off-by: Jay Vosburgh <jay.vosburgh@...onical.com>
Fixes: b0929915e035 ("bonding: Fix RTNL: assertion failed at net/core/rtnetlink.c for ab arp monitor")
Link: https://lore.kernel.org/netdev/b2fd4147-8f50-bebd-963a-1a3e8d1d9715@redhat.com/
Tested-by: Jonathan Toppins <jtoppins@...hat.com>
Reviewed-by: Jonathan Toppins <jtoppins@...hat.com>
Link: https://lore.kernel.org/r/9400.1655407960@famine
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/bonding/bond_main.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 0d9226bdf661..33843b89ab04 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -3014,9 +3014,11 @@ static void bond_activebackup_arp_mon(struct work_struct *work)
 		if (!rtnl_trylock())
 			return;
 
-		if (should_notify_peers)
+		if (should_notify_peers) {
+			bond->send_peer_notif--;
 			call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
 						 bond->dev);
+		}
 		if (should_notify_rtnl) {
 			bond_slave_state_notify(bond);
 			bond_slave_link_notify(bond);
-- 
2.35.1