netdev - Re: [PATCH 1/2] sh_eth: check platform data pointer

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Date:	Wed, 4 Sep 2013 15:48:34 +0900
From:	Simon Horman <horms@...ge.net.au>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Cc:	netdev@...r.kernel.org, nobuhiro.iwamatsu.yj@...esas.com,
	linux-sh@...r.kernel.org
Subject: Re: [PATCH 1/2] sh_eth: check platform data pointer

On Sat, Aug 31, 2013 at 04:23:29AM +0400, Sergei Shtylyov wrote:
> Check the platform data pointer before dereferencing it and error out of the
> probe() method if it's NULL.
> 
> This has additional effect of preventing kernel oops with outdated platform data
> containing zero PHY address instead (such as on SolutionEngine7710).
> 
> Signed-off-by: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>


Reviewed-by: Simon Horman <horms@...ge.net.au>

> 
> ---
> This patch is against Dave's 'net-next.git' repo.
> 
>  drivers/net/ethernet/renesas/sh_eth.c |    6 ++++++
>  1 file changed, 6 insertions(+)
> 
> Index: net-next/drivers/net/ethernet/renesas/sh_eth.c
> ===================================================================
> --- net-next.orig/drivers/net/ethernet/renesas/sh_eth.c
> +++ net-next/drivers/net/ethernet/renesas/sh_eth.c
> @@ -2653,6 +2653,12 @@ static int sh_eth_drv_probe(struct platf
>  	pm_runtime_enable(&pdev->dev);
>  	pm_runtime_resume(&pdev->dev);
>  
> +	if (!pd) {
> +		dev_err(&pdev->dev, "no platform data\n");
> +		ret = -EINVAL;
> +		goto out_release;
> +	}
> +
>  	/* get PHY ID */
>  	mdp->phy_id = pd->phy;
>  	mdp->phy_interface = pd->phy_interface;
> --
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