netdev - Re: [PATCH 07/11] igb: Avoid uninitialized advertised variable in eee_set

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Date:	Tue, 01 Oct 2013 16:10:02 -0700
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	linux-kernel@...r.kernel.org, Andi Kleen <ak@...ux.intel.com>,
	netdev@...r.kernel.org
Subject: Re: [PATCH 07/11] igb: Avoid uninitialized advertised variable in
 eee_set_cur

On Mon, 2013-09-30 at 13:29 -0700, Andi Kleen wrote:
> From: Andi Kleen <ak@...ux.intel.com>
> 
> eee_get_cur assumes that the output data is already zeroed. It can
> read-modify-write the advertised field:
> 
>               if (ipcnfg & E1000_IPCNFG_EEE_100M_AN)
> 2594                    edata->advertised |= ADVERTISED_100baseT_Full;
> 
> This is ok for the normal ethtool eee_get call, which always
> zeroes the input data before.
> 
> But eee_set_cur also calls eee_get_cur and it did not zero the input
> field. Later on it then compares agsinst the field, which can contain
> partial
> stack garbage.
> 
> Zero the input field in eee_set_cur() too.
> 
> Cc: jeffrey.t.kirsher@...el.com
> Cc: netdev@...r.kernel.org
> Signed-off-by: Andi Kleen <ak@...ux.intel.com>
> ---
>  drivers/net/ethernet/intel/igb/igb_ethtool.c | 2 ++
>  1 file changed, 2 insertions(+)

Acked-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>

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