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

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Message-ID: <ea758981-9329-9594-5e25-f75376bc61a5@canonical.com>
Date:   Fri, 22 Sep 2017 12:55:16 +0100
From:   Colin Ian King <colin.king@...onical.com>
To:     Dan Carpenter <dan.carpenter@...cle.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 22/09/17 12:50, Dan Carpenter wrote:
> 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
> 
Thanks, stupid me. I'll fix that up.