Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Subject: Re: [PATCH] net: bonding: fix error return code of bond_neigh_init()
To:     Roi Dayan <roid@nvidia.com>, j.vosburgh@gmail.com,
        vfalico@gmail.com, andy@greyhouse.net, davem@davemloft.net,
        kuba@kernel.org
Cc:     netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
        Saeed Mahameed <saeedm@nvidia.com>
References: <20210308031102.26730-1-baijiaju1990@gmail.com>
 <e15f36f7-6421-69a3-f10a-45b83621b96f@nvidia.com>
From:   Jia-Ju Bai <baijiaju1990@gmail.com>
Message-ID: <ff2fdc70-4ee5-a0eb-64d7-4deb39a62e03@gmail.com>
Date:   Wed, 10 Mar 2021 17:29:53 +0800
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101
 Thunderbird/68.4.1
MIME-Version: 1.0
In-Reply-To: <e15f36f7-6421-69a3-f10a-45b83621b96f@nvidia.com>
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 8bit
Content-Language: en-US
Precedence: bulk


On 2021/3/10 17:24, Roi Dayan wrote:
>
>
> On 2021-03-08 5:11 AM, Jia-Ju Bai wrote:
>> When slave is NULL or slave_ops->ndo_neigh_setup is NULL, no error
>> return code of bond_neigh_init() is assigned.
>> To fix this bug, ret is assigned with -EINVAL in these cases.
>>
>> Fixes: 9e99bfefdbce ("bonding: fix bond_neigh_init()")
>> Reported-by: TOTE Robot <oslab@tsinghua.edu.cn>
>> Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
>> ---
>>   drivers/net/bonding/bond_main.c | 8 ++++++--
>>   1 file changed, 6 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/net/bonding/bond_main.c 
>> b/drivers/net/bonding/bond_main.c
>> index 74cbbb22470b..456315bef3a8 100644
>> --- a/drivers/net/bonding/bond_main.c
>> +++ b/drivers/net/bonding/bond_main.c
>> @@ -3978,11 +3978,15 @@ static int bond_neigh_init(struct neighbour *n)
>>         rcu_read_lock();
>>       slave = bond_first_slave_rcu(bond);
>> -    if (!slave)
>> +    if (!slave) {
>> +        ret = -EINVAL;
>>           goto out;
>> +    }
>>       slave_ops = slave->dev->netdev_ops;
>> -    if (!slave_ops->ndo_neigh_setup)
>> +    if (!slave_ops->ndo_neigh_setup) {
>> +        ret = -EINVAL;
>>           goto out;
>> +    }
>>         /* TODO: find another way [1] to implement this.
>>        * Passing a zeroed structure is fragile,
>>
>
>
> Hi,
>
> This breaks basic functionally that always worked. A slave doesn't need
> to exists nor to implement ndo_neigh_setup.
> Now trying to add a neigh entry because of that fails.
> This commit needs to be reverted.
>

Okay, thanks for the explanation, and I am sorry for this false report...


Best wishes,
Jia-Ju Bai