netdev - Re: [PATCH net-next,v3] bonding: use WARN_ON instead of BUG in alb_upper_dev

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Date: Wed, 15 Nov 2023 15:22:39 +0100
From: Jiri Pirko <jiri@...nulli.us>
To: Zhengchao Shao <shaozhengchao@...wei.com>
Cc: netdev@...r.kernel.org, davem@...emloft.net, edumazet@...gle.com,
	kuba@...nel.org, pabeni@...hat.com, j.vosburgh@...il.com,
	andy@...yhouse.net, weiyongjun1@...wei.com, yuehaibing@...wei.com
Subject: Re: [PATCH net-next,v3] bonding: use WARN_ON instead of BUG in
 alb_upper_dev_walk

Wed, Nov 15, 2023 at 12:55:37PM CET, shaozhengchao@...wei.com wrote:
>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.
>
>Signed-off-by: Zhengchao Shao <shaozhengchao@...wei.com>
>---
>v3: return -ENOMEM instead of zero to stop walk
>v2: use WARN_ON_ONCE instead of WARN_ON

Yet the WARN_ON is back :O


>---
> 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..21f1cb8e453b 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(1);
>+			return -ENOMEM;
>+		}
> 		alb_send_lp_vid(slave, upper->dev_addr,
> 				tags[0].vlan_proto, tags[0].vlan_id);
> 		kfree(tags);
>-- 
>2.34.1
>
>