netdev - Re: [PATCH net] net: sched: fix NULL pointer dereference in mq

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Message-ID: <889f39b7-92dc-1c37-e164-b16610de9999@huawei.com>
Date: Mon, 29 May 2023 18:18:50 +0800
From: shaozhengchao <shaozhengchao@...wei.com>
To: Peilin Ye <yepeilin.cs@...il.com>, Jamal Hadi Salim <jhs@...atatu.com>
CC: <netdev@...r.kernel.org>, <xiyou.wangcong@...il.com>, <jiri@...nulli.us>,
	<davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
	<pabeni@...hat.com>, <weiyongjun1@...wei.com>, <yuehaibing@...wei.com>,
	<wanghai38@...wei.com>
Subject: Re: [PATCH net] net: sched: fix NULL pointer dereference in mq_attach



On 2023/5/29 16:59, Peilin Ye wrote:
> On Mon, May 29, 2023 at 09:10:23AM +0800, shaozhengchao wrote:
>> On 2023/5/29 3:05, Jamal Hadi Salim wrote:
>>> On Sat, May 27, 2023 at 5:30 AM Zhengchao Shao <shaozhengchao@...wei.com> wrote:
>>>> When use the following command to test:
>>>> 1)ip link add bond0 type bond
>>>> 2)ip link set bond0 up
>>>> 3)tc qdisc add dev bond0 root handle ffff: mq
>>>> 4)tc qdisc replace dev bond0 parent ffff:fff1 handle ffff: mq
>>>
>>> This is fixed by Peilin in this ongoing discussion:
>>> https://lore.kernel.org/netdev/cover.1684887977.git.peilin.ye@bytedance.com/
>>>
>>        Thank you for your reply. I have notice Peilin's patches before,
>> and test after the patch is incorporated in local host. But it still
>> triggers the problem.
>>        Peilin's patches can be filtered out when the query result of
>> qdisc_lookup is of the ingress type. Here is 4/6 patch in his patches.
>> +if (q->flags & TCQ_F_INGRESS) {
>> +     NL_SET_ERR_MSG(extack,
>> +                    "Cannot regraft ingress or clsact Qdiscs");
>> +     return -EINVAL;
>> +}
>>        However, the query result of my test case in qdisc_lookup is mq.
>> Therefore, the patch cannot solve my problem.
> 
> Ack, they are different: patch [4/6] prevents ingress (clsact) Qdiscs
> from being regrafted (to elsewhere), and Zhengchao's patch prevents other
> Qdiscs from being regrafted to ffff:fff1.
> 
> Thanks,
> Peilin Ye
> 
Hi Peilin:
	Thank you for your ack.

Zhengchao Shao