netdev - Re: [NET-NEXT PATCH 09/14] e1000e: fix possible buffer overflow

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Date:	Fri, 21 Nov 2008 16:57:00 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	jeffrey.t.kirsher@...el.com
Cc:	netdev@...r.kernel.org, jeff@...zik.org, bruce.w.allan@...el.com
Subject: Re: [NET-NEXT PATCH 09/14] e1000e: fix possible buffer overflow

From: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Date: Fri, 21 Nov 2008 11:01:28 -0800

> From: Bruce Allan <bruce.w.allan@...el.com>
> 
> Put in missing bounds checking of an array.
> 
> Signed-off-by: Bruce Allan <bruce.w.allan@...el.com>
> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>

No magic constants, please.  What does the "+ 5" mean?

And using a macro that is:

1) Used in exactly one place
2) Gives no more information than the expanded ARRAY_SIZE()

is pretty useless as well.

Patch not applied.

> @@ -721,6 +723,9 @@ static s32 e1000_get_cable_length_80003es2lan(struct e1000_hw *hw)
>  		return ret_val;
>  
>  	index = phy_data & GG82563_DSPD_CABLE_LENGTH;
> +	if (index >= GG82563_CABLE_LENGTH_TABLE_SIZE + 5)
> +		return E1000_ERR_PHY;
> +
>  	phy->min_cable_length = e1000_gg82563_cable_length_table[index];
>  	phy->max_cable_length = e1000_gg82563_cable_length_table[index+5];
>  
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