netdev - Re: [PATCH] eexpress: Read buffer overflow

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Message-ID: <20090729200517.GB3058@ami.dom.local>
Date:	Wed, 29 Jul 2009 22:05:17 +0200
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Roel Kluin <roel.kluin@...il.com>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	akpm@...ux-foundation.org
Subject: Re: [PATCH] eexpress: Read buffer overflow

On Wed, Jul 29, 2009 at 03:18:56PM +0200, Roel Kluin wrote:
> start_code is 69 words, but the code always writes a multiple of 16 words,
> so the last 11 words written are outside the array.
> 
> Signed-off-by: Roel Kluin <roel.kluin@...il.com>
> ---
> > Now you seem to make my previous math working :-)
> > 
> >>> (max) i = 64, (max) j = 14, (64+14+16)/2 = 47 < 69, so it seems to copy
> >>> less than its size?
> > 
> > Jarek P.
> > 
> 
> You're right, thanks for reviewing, this one should be correct.

Looks OK to me.

Thanks,
Jarek P.

> 
> diff --git a/drivers/net/eexpress.c b/drivers/net/eexpress.c
> index 1686dca..1f016d6 100644
> --- a/drivers/net/eexpress.c
> +++ b/drivers/net/eexpress.c
> @@ -1474,13 +1474,13 @@ static void eexp_hw_init586(struct net_device *dev)
>  	outw(0x0000, ioaddr + 0x800c);
>  	outw(0x0000, ioaddr + 0x800e);
>  
> -	for (i = 0; i < (sizeof(start_code)); i+=32) {
> +	for (i = 0; i < ARRAY_SIZE(start_code) * 2; i+=32) {
>  		int j;
>  		outw(i, ioaddr + SM_PTR);
> -		for (j = 0; j < 16; j+=2)
> +		for (j = 0; j < 16 && (i+j)/2 < ARRAY_SIZE(start_code); j+=2)
>  			outw(start_code[(i+j)/2],
>  			     ioaddr+0x4000+j);
> -		for (j = 0; j < 16; j+=2)
> +		for (j = 0; j < 16 && (i+j+16)/2 < ARRAY_SIZE(start_code); j+=2)
>  			outw(start_code[(i+j+16)/2],
>  			     ioaddr+0x8000+j);
>  	}
--
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