linux-kernel - Re: [v2] net:ethernet:cavium:octeon:octeon_mgmt: Handle return NULL error from devm

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Date:   Wed, 14 Dec 2016 09:32:46 -0800
From:   David Daney <ddaney@...iumnetworks.com>
To:     Arvind Yadav <arvind.yadav.cs@...il.com>, <peter.chen@....com>,
        <fw@...len.de>, <david.daney@...ium.com>
CC:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [v2] net:ethernet:cavium:octeon:octeon_mgmt: Handle return NULL
 error from devm_ioremap

On 12/14/2016 08:25 AM, Arvind Yadav wrote:
> Here, If devm_ioremap will fail. It will return NULL.
> Kernel can run into a NULL-pointer dereference.
> This error check will avoid NULL pointer dereference.
>

Have you ever seen this failure in the wild?

How was the patch tested?

Thanks,
David Daney


> Signed-off-by: Arvind Yadav <arvind.yadav.cs@...il.com>
> ---
>  drivers/net/ethernet/cavium/octeon/octeon_mgmt.c | 6 ++++++
>  1 file changed, 6 insertions(+)
>
> diff --git a/drivers/net/ethernet/cavium/octeon/octeon_mgmt.c b/drivers/net/ethernet/cavium/octeon/octeon_mgmt.c
> index 4ab404f..33c2fec 100644
> --- a/drivers/net/ethernet/cavium/octeon/octeon_mgmt.c
> +++ b/drivers/net/ethernet/cavium/octeon/octeon_mgmt.c
> @@ -1479,6 +1479,12 @@ static int octeon_mgmt_probe(struct platform_device *pdev)
>  	p->agl = (u64)devm_ioremap(&pdev->dev, p->agl_phys, p->agl_size);
>  	p->agl_prt_ctl = (u64)devm_ioremap(&pdev->dev, p->agl_prt_ctl_phys,
>  					   p->agl_prt_ctl_size);
> +	if (!p->mix || !p->agl || !p->agl_prt_ctl) {
> +		dev_err(&pdev->dev, "failed to map I/O memory\n");
> +		result = -ENOMEM;
> +		goto err;
> +	}
> +
>  	spin_lock_init(&p->lock);
>
>  	skb_queue_head_init(&p->tx_list);
>