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igb: Avoid uninitialized advertised variable in eee_set_cur

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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@intel.com
Cc: netdev@vger.kernel.org
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andi Kleen 2013-09-30 13:29:08 -07:00 committed by David S. Miller
parent 52f77ba925
commit 58e4e1f6ca
1 changed files with 2 additions and 0 deletions
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2
drivers/net/ethernet/intel/igb/igb_ethtool.c
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@ -2655,6 +2655,8 @@ static int igb_set_eee(struct net_device *netdev,
(hw->phy.media_type != e1000_media_type_copper))
return -EOPNOTSUPP;
memset(&eee_curr, 0, sizeof(struct ethtool_eee));
ret_val = igb_get_eee(netdev, &eee_curr);
if (ret_val)
return ret_val;