netdev - Re: [PATCH] fealnx: Write outside array bounds

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Date:	Sat, 25 Jul 2009 12:55:18 +0300 (EEST)
From:	"Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi>
To:	Roel Kluin <roel.kluin@...il.com>
cc:	"David S. Miller" <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] fealnx: Write outside array bounds

On Fri, 24 Jul 2009, Roel Kluin wrote:

> phy_idx is checked to be < 4, but np->phys[] is 2 elements long
> 
> Signed-off-by: Roel Kluin <roel.kluin@...il.com>
> ---
> Or should the number of elements be increased?
> 
> diff --git a/drivers/net/fealnx.c b/drivers/net/fealnx.c
> index 48385c4..100badd 100644
> --- a/drivers/net/fealnx.c
> +++ b/drivers/net/fealnx.c
> @@ -584,7 +584,7 @@ static int __devinit fealnx_init_one(struct pci_dev *pdev,
>  	if (np->flags == HAS_MII_XCVR) {
>  		int phy, phy_idx = 0;
>  
> -		for (phy = 1; phy < 32 && phy_idx < 4; phy++) {
> +		for (phy = 1; phy < 32 && phy_idx < 2; phy++) {
>  			int mii_status = mdio_read(dev, phy, 1);
>  
>  			if (mii_status != 0xffff && mii_status != 0x0000) {

In either of the case, one should use ARRAY_SIZE(np->phys) instead of the 
number.


-- 
 i.
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