netdev - [PATCH net 1/4] bonding: fix send_peer

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Date:   Thu, 20 Apr 2023 16:22:27 +0800
From:   Hangbin Liu <liuhangbin@...il.com>
To:     netdev@...r.kernel.org
Cc:     Jay Vosburgh <j.vosburgh@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Liang Li <liali@...hat.com>,
        Vincent Bernat <vincent@...nat.ch>,
        Hangbin Liu <liuhangbin@...il.com>
Subject: [PATCH net 1/4] bonding: fix send_peer_notif overflow

Bonding send_peer_notif was defined as u8. Since commit 07a4ddec3ce9
("bonding: add an option to specify a delay between peer notifications").
the bond->send_peer_notif will be num_peer_notif multiplied by
peer_notif_delay, which is u8 * u32. This would cause the send_peer_notif
overflow easily. e.g.

  ip link add bond0 type bond mode 1 miimon 100 num_grat_arp 30 peer_notify_delay 1000

To fix the overflow, we have to set the send_peer_notif large enough.

Fixes: 07a4ddec3ce9 ("bonding: add an option to specify a delay between peer notifications")
Reported-by: Liang Li <liali@...hat.com>
Signed-off-by: Hangbin Liu <liuhangbin@...il.com>
---
 include/net/bonding.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/net/bonding.h b/include/net/bonding.h
index c3843239517d..f4d376420e4d 100644
--- a/include/net/bonding.h
+++ b/include/net/bonding.h
@@ -233,7 +233,7 @@ struct bonding {
 	 */
 	spinlock_t mode_lock;
 	spinlock_t stats_lock;
-	u8	 send_peer_notif;
+	u64	 send_peer_notif;
 	u8       igmp_retrans;
 #ifdef CONFIG_PROC_FS
 	struct   proc_dir_entry *proc_entry;
-- 
2.38.1