netdev - Re: [EXT] Re: [PATCH net 1/2] octeontx2-pf: Fix possible memory leak in otx2

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Date:   Fri, 2 Dec 2022 16:34:23 +0800
From:   "Ziyang Xuan (William)" <william.xuanziyang@...wei.com>
To:     Geethasowjanya Akula <gakula@...vell.com>,
        Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
        "sunil.kovvuri@...il.com" <sunil.kovvuri@...il.com>,
        Sunil Kovvuri Goutham <sgoutham@...vell.com>
CC:     Subbaraya Sundeep Bhatta <sbhatta@...vell.com>,
        Hariprasad Kelam <hkelam@...vell.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Naveen Mamindlapalli <naveenm@...vell.com>,
        Rakesh Babu Saladi <rsaladi2@...vell.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [EXT] Re: [PATCH net 1/2] octeontx2-pf: Fix possible memory leak
 in otx2_probe()

> 
> ________________________________________
> From: Ziyang Xuan (William) <william.xuanziyang@...wei.com>
> Sent: Friday, December 2, 2022 7:14 AM
> To: Maciej Fijalkowski; sunil.kovvuri@...il.com; Sunil Kovvuri Goutham
> Cc: Geethasowjanya Akula; Subbaraya Sundeep Bhatta; Hariprasad Kelam; davem@...emloft.net; edumazet@...gle.com; kuba@...nel.org; pabeni@...hat.com; netdev@...r.kernel.org; Naveen Mamindlapalli; Rakesh Babu Saladi; linux-kernel@...r.kernel.org
> Subject: [EXT] Re: [PATCH net 1/2] octeontx2-pf: Fix possible memory leak in otx2_probe()
> 
> External Email
> 
> ----------------------------------------------------------------------
>>>> On Thu, Nov 24, 2022 at 09:56:43AM +0800, Ziyang Xuan wrote:
>>>>> In otx2_probe(), there are several possible memory leak bugs
>>>>> in exception paths as follows:
>>>>> 1. Do not release pf->otx2_wq when excute otx2_init_tc() failed.
>>>>> 2. Do not shutdown tc when excute otx2_register_dl() failed.
>>>>> 3. Do not unregister devlink when initialize SR-IOV failed.
>>>>>
>>>>> Fixes: 1d4d9e42c240 ("octeontx2-pf: Add tc flower hardware offload on ingress traffic")
>>>>> Fixes: 2da489432747 ("octeontx2-pf: devlink params support to set mcam entry count")
>>>>> Signed-off-by: Ziyang Xuan <william.xuanziyang@...wei.com>
>>>>> ---
>>>>>  drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c | 5 ++++-
>>>>>  1 file changed, 4 insertions(+), 1 deletion(-)
>>>>>
>>>>> diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c
>>>>> index 303930499a4c..8d7f2c3b0cfd 100644
>>>>> --- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c
>>>>> +++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c
>>>>> @@ -2900,7 +2900,7 @@ static int otx2_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>>>>>
>>>>>     err = otx2_register_dl(pf);
>>>>>     if (err)
>>>>> -           goto err_mcam_flow_del;
>>>>> +           goto err_register_dl;
>>>>>
>>>>>     /* Initialize SR-IOV resources */
>>>>>     err = otx2_sriov_vfcfg_init(pf);
>>>>> @@ -2919,8 +2919,11 @@ static int otx2_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>>>>>     return 0;
>>>>
>>>> If otx2_dcbnl_set_ops() fails at the end then shouldn't we also call
>>>> otx2_sriov_vfcfg_cleanup() ?
>>>
>>> I think it does not need. This is the probe process. PF and VF are all not ready to work,
>>> so pf->vf_configs[i].link_event_work does not scheduled. And pf->vf_configs memory resource will
>>> be freed by devm subsystem if probe failed. There are not memory leak and other problems.
>>>
>> Hello Sunil Goutham, Maciej Fijalkowski,
> 
>> What do you think about my analysis? Look forward to your >reply.
> otx2_sriov_vfcfg_cleanup() is not required. Since PF probe is failed, link event won't get triggered.
> 
Hello Geetha,

If there is not any other question, can you add "Reviewed-by" for my patchset?

Thank you!

> Thanks,
> Geetha.
>> Thank you!
> 
>>> @Sunil Goutham, Please help to confirm.
>>>
>>> Thanks.
>>>
>>>>
>>>>>
>>>>>  err_pf_sriov_init:
>>>>> +   otx2_unregister_dl(pf);
>>>>> +err_register_dl:
>>>>>     otx2_shutdown_tc(pf);
>>>>>  err_mcam_flow_del:
>>>>> +   destroy_workqueue(pf->otx2_wq);
>>>>>     otx2_mcam_flow_del(pf);
>>>>>  err_unreg_netdev:
>>>>>     unregister_netdev(netdev);
>>>>> --
>>>>> 2.25.1
>>>>>
>>>> .
>>>>
>>> .
>>>
> .
>