netdev - Re: [PATCH] e1000: avoid null pointer dereference on invalid stat type

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Message-ID: <20170922115038.ckvl6zsmadrqiige@mwanda>
Date:   Fri, 22 Sep 2017 14:50:38 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Colin King <colin.king@...onical.com>
Cc:     Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] e1000: avoid null pointer dereference on invalid stat
 type

On Thu, Sep 21, 2017 at 11:01:58PM +0100, Colin King wrote:
> @@ -1837,12 +1838,13 @@ static void e1000_get_ethtool_stats(struct net_device *netdev,
>  			p = (char *)adapter + stat->stat_offset;
>  			break;
>  		default:
> +			p = NULL;
>  			WARN_ONCE(1, "Invalid E1000 stat type: %u index %d\n",
>  				  stat->type, i);
>  			break;
>  		}
>  
> -		if (stat->sizeof_stat == sizeof(u64))
> +		if (p && stat->sizeof_stat == sizeof(u64))
>  			data[i] = *(u64 *)p;
>  		else
>  			data[i] = *(u32 *)p;
                                   ^^^^^^^^

The else side will still crash.

regards,
dan carpenter