linux-kernel - [PATCH net] bonding: fix reference count leak in balance-alb mode

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Message-ID: <26758.1660194413@famine>
Date:   Wed, 10 Aug 2022 22:06:53 -0700
From:   Jay Vosburgh <jay.vosburgh@...onical.com>
To:     netdev@...r.kernel.org, sunshouxin@...natelecom.cn
Cc:     vfalico@...il.com, andy@...yhouse.net, razor@...ckwall.org,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, linux-kernel@...r.kernel.org,
        huyd12@...natelecom.cn
Subject: [PATCH net] bonding: fix reference count leak in balance-alb mode

	Commit d5410ac7b0ba ("net:bonding:support balance-alb interface
with vlan to bridge") introduced a reference count leak by not releasing
the reference acquired by ip_dev_find().  Remedy this by insuring the
reference is released.

Fixes: d5410ac7b0ba ("net:bonding:support balance-alb interface with vlan to bridge")
Signed-off-by: Jay Vosburgh <jay.vosburgh@...onical.com>

---
 drivers/net/bonding/bond_alb.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/bonding/bond_alb.c b/drivers/net/bonding/bond_alb.c
index 60cb9a0225aa..b9dbad3a8af8 100644
--- a/drivers/net/bonding/bond_alb.c
+++ b/drivers/net/bonding/bond_alb.c
@@ -668,8 +668,11 @@ static struct slave *rlb_arp_xmit(struct sk_buff *skb, struct bonding *bond)
 
 	dev = ip_dev_find(dev_net(bond->dev), arp->ip_src);
 	if (dev) {
-		if (netif_is_bridge_master(dev))
+		if (netif_is_bridge_master(dev)) {
+			dev_put(dev);
 			return NULL;
+		}
+		dev_put(dev);
 	}
 
 	if (arp->op_code == htons(ARPOP_REPLY)) {
-- 
2.17.1