linux-kernel - Re: [patch] eicon: make buffer larger

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Date:	Wed, 6 Oct 2010 10:21:02 +0200 (CEST)
From:	Armin Schindler <armin@...ware.de>
To:	Dan Carpenter <error27@...il.com>
cc:	Karsten Keil <isdn@...ux-pingi.de>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [patch] eicon: make buffer larger

On Wed, 6 Oct 2010, Dan Carpenter wrote:
> On Wed, Oct 06, 2010 at 09:25:44AM +0200, Armin Schindler wrote:
>> On Mon, 4 Oct 2010, Dan Carpenter wrote:
>>> In diva_mnt_add_xdi_adapter() we do this:
>>>  strcpy (clients[id].drvName,     tmp);
>>>  strcpy (clients[id].Dbg.drvName, tmp);
>>>
>>> The "clients[id].drvName" is a 128 character buffer and
>>> "clients[id].Dbg.drvName" was originally a 16 character buffer but I've
>>> changed it to 128 as well.  We don't actually use 128 characters but we
>>> do use more than 16.
>>
>> I don't see any reason for that change. The driver names here do not use
>> more than 16 characters and when filled, the length is checked anyway.
>> Please avoid changing the size of that structure.
>>
>
> drivers/isdn/hardware/eicon/debug.c diva_mnt_add_xdi_adapter()
>   874      sprintf (tmp, "ADAPTER:%d SN:%u-%d",
>                           12345678 90123 45 67
>
> 	That's a minimum 17 characters.
>
>   875               (int)logical,
>   876               serial & 0x00ffffff,
>   877               (byte)(((serial & 0xff000000) >> 24) + 1));
>   878    } else {
>   879      sprintf (tmp, "ADAPTER:%d SN:%u", (int)logical, serial);
>   880    }

this is tmp with a bigger size. It seems you are mixing the sizes of 
drvName and tmp.

Armin
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