netdev - [PATCH net-next,v2] bonding: use WARN_ON_ONCE instead of BUG in alb_upper_dev

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Message-ID: <20231114091829.2509952-1-shaozhengchao@huawei.com>
Date: Tue, 14 Nov 2023 17:18:29 +0800
From: Zhengchao Shao <shaozhengchao@...wei.com>
To: <netdev@...r.kernel.org>, <davem@...emloft.net>, <edumazet@...gle.com>,
	<kuba@...nel.org>, <pabeni@...hat.com>
CC: <j.vosburgh@...il.com>, <andy@...yhouse.net>, <weiyongjun1@...wei.com>,
	<yuehaibing@...wei.com>, <shaozhengchao@...wei.com>
Subject: [PATCH net-next,v2] bonding: use WARN_ON_ONCE instead of BUG in alb_upper_dev_walk

If failed to allocate "tags" or could not find the final upper device from
start_dev's upper list in bond_verify_device_path(), only the loopback
detection of the current upper device should be affected, and the system is
no need to be panic.
Using WARN_ON_ONCE here is to avoid spamming the log if there's a lot of
macvlans above the bond.

Signed-off-by: Zhengchao Shao <shaozhengchao@...wei.com>
---
v2: use WARN_ON_ONCE instead of WARN_ON
---
 drivers/net/bonding/bond_alb.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/bonding/bond_alb.c b/drivers/net/bonding/bond_alb.c
index dc2c7b979656..a7bad0fff8cb 100644
--- a/drivers/net/bonding/bond_alb.c
+++ b/drivers/net/bonding/bond_alb.c
@@ -984,8 +984,10 @@ static int alb_upper_dev_walk(struct net_device *upper,
 	 */
 	if (netif_is_macvlan(upper) && !strict_match) {
 		tags = bond_verify_device_path(bond->dev, upper, 0);
-		if (IS_ERR_OR_NULL(tags))
-			BUG();
+		if (IS_ERR_OR_NULL(tags)) {
+			WARN_ON_ONCE(1);
+			return 0;
+		}
 		alb_send_lp_vid(slave, upper->dev_addr,
 				tags[0].vlan_proto, tags[0].vlan_id);
 		kfree(tags);
-- 
2.34.1