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

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Date:   Fri, 2 Dec 2022 06:38:01 +0000
From:   Geethasowjanya Akula <gakula@...vell.com>
To:     "Ziyang Xuan (William)" <william.xuanziyang@...wei.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.

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
>>>>
>>> .
>>>
>> .
>>