netdev - Re: [PATCH net-next,v5] bonding: return -ENOMEM instead of BUG in alb_upper_dev

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Date: Thu, 23 Nov 2023 09:38:05 +0800
From: shaozhengchao <shaozhengchao@...wei.com>
To: Paolo Abeni <pabeni@...hat.com>, <netdev@...r.kernel.org>,
	<davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>
CC: <j.vosburgh@...il.com>, <andy@...yhouse.net>, <weiyongjun1@...wei.com>,
	<yuehaibing@...wei.com>
Subject: Re: [PATCH net-next,v5] bonding: return -ENOMEM instead of BUG in
 alb_upper_dev_walk



On 2023/11/23 0:16, Paolo Abeni wrote:
> On Wed, 2023-11-22 at 10:04 +0800, shaozhengchao wrote:
>>
>> On 2023/11/21 20:58, Zhengchao Shao 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.
>>> So just return -ENOMEM in alb_upper_dev_walk to stop walking.
>>>
>>> I also think that the following function calls
>>> netdev_walk_all_upper_dev_rcu
>>> ---->>>alb_upper_dev_walk
>>> ---------->>>bond_verify_device_path
>>>>  From this way, "end device" can eventually be obtained from "start device"
>>> in bond_verify_device_path, IS_ERR(tags) could be instead of
>>> IS_ERR_OR_NULL(tags) in alb_upper_dev_walk.
>>>
>>> Signed-off-by: Zhengchao Shao <shaozhengchao@...wei.com>
>>> Acked-by: Jay Vosburgh <jay.vosburgh@...onical.com>
>>> ---
>>> v5: drop print information, if the memory allocation fails, the mm layer
>>>       will emit a lot warning comprising the backtrace
>>> v4: print information instead of warn
>>> v3: return -ENOMEM instead of zero to stop walk
>>> v2: use WARN_ON_ONCE instead of WARN_ON
>>> ---
>>>    drivers/net/bonding/bond_alb.c | 3 ++-
>>>    1 file changed, 2 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/net/bonding/bond_alb.c b/drivers/net/bonding/bond_alb.c
>>> index dc2c7b979656..7edf0fd58c34 100644
>>> --- a/drivers/net/bonding/bond_alb.c
>>> +++ b/drivers/net/bonding/bond_alb.c
>>> @@ -985,7 +985,8 @@ 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();
>>> +			return -ENOMEM;
>>> +
>>>    		alb_send_lp_vid(slave, upper->dev_addr,
>>>    				tags[0].vlan_proto, tags[0].vlan_id);
>>>    		kfree(tags);
>> Hi Paolo:
>> 	I find that v4 has been merged into net-next.
> 
> I'm sorry, that was due to PEBKAC here.
> 
>> So v5 is not
>> needed. But should I send another patch to drop that print info?
> 
> Yes please, send a follow-up just dropping the print.
> 
OK， I will do it today.
Thanks

Zhengchao Shao
> Thanks!
> 
> Paolo
> 
>