netdev - Re: [PATCH] sfc: Fix an error handling path in efx_pci

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Date:   Mon, 31 Oct 2022 09:09:35 +0000
From:   Martin Habets <habetsm.xilinx@...il.com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     Edward Cree <ecree.xilinx@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Jonathan Cooper <jonathan.s.cooper@....com>,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH] sfc: Fix an error handling path in efx_pci_probe()

Please specify a branch in the subject.
This patch should go to net.

On Sat, Oct 29, 2022 at 10:57:11PM +0200, Christophe JAILLET wrote:
> If an error occurs after the first kzalloc() the corresponding memory
> allocation is never freed.
> 
> Add the missing kfree() in the error handling path, as already done in the
> remove() function.
> 
> Fixes: 7e773594dada ("sfc: Separate efx_nic memory from net_device memory")
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>

Acked-by: Martin Habets <habetsm.xilinx@...il.com>

> ---
> When 7e773594dada was merged, sfc/ef100.c had the same issue.
> But it seems to have been fixed in 98ff4c7c8ac7.

I agree.

> ---
>  drivers/net/ethernet/sfc/efx.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/sfc/efx.c b/drivers/net/ethernet/sfc/efx.c
> index 054d5ce6029e..0556542d7a6b 100644
> --- a/drivers/net/ethernet/sfc/efx.c
> +++ b/drivers/net/ethernet/sfc/efx.c
> @@ -1059,8 +1059,10 @@ static int efx_pci_probe(struct pci_dev *pci_dev,
>  
>  	/* Allocate and initialise a struct net_device */
>  	net_dev = alloc_etherdev_mq(sizeof(probe_data), EFX_MAX_CORE_TX_QUEUES);
> -	if (!net_dev)
> -		return -ENOMEM;
> +	if (!net_dev) {
> +		rc = -ENOMEM;
> +		goto fail0;
> +	}
>  	probe_ptr = netdev_priv(net_dev);
>  	*probe_ptr = probe_data;
>  	efx->net_dev = net_dev;
> @@ -1132,6 +1134,8 @@ static int efx_pci_probe(struct pci_dev *pci_dev,
>  	WARN_ON(rc > 0);
>  	netif_dbg(efx, drv, efx->net_dev, "initialisation failed. rc=%d\n", rc);
>  	free_netdev(net_dev);
> + fail0:
> +	kfree(probe_data);
>  	return rc;
>  }
>  
> -- 
> 2.34.1