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

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Date:   Fri, 25 Nov 2022 14:46:05 +0100
From:   Maciej Fijalkowski <maciej.fijalkowski@...el.com>
To:     Ziyang Xuan <william.xuanziyang@...wei.com>
CC:     <sgoutham@...vell.com>, <gakula@...vell.com>,
        <sbhatta@...vell.com>, <hkelam@...vell.com>, <davem@...emloft.net>,
        <edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>,
        <netdev@...r.kernel.org>, <naveenm@...vell.com>,
        <rsaladi2@...vell.com>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net 1/2] octeontx2-pf: Fix possible memory leak in
 otx2_probe()

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() ?

>  
>  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
>