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net: sun: sungem: rix a possible null dereference

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The function gem_begin_auto_negotiation dereference
the pointer ep before testing if it's null. This
patch add a check on ep before dereferencing it.

Fixes: 92552fdda5 ("net: sun: sungem: use new api
ethtool_{get|set}_link_ksettings")

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Philippe Reynes <tremyfr@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Philippe Reynes 2017-03-17 22:54:04 +01:00 committed by David S. Miller
parent c5b71e633d
commit e74bad6b01
1 changed files with 3 additions and 2 deletions
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5
drivers/net/ethernet/sun/sungem.c
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@ -1259,8 +1259,9 @@ static void gem_begin_auto_negotiation(struct gem *gp,
int duplex;
u32 advertising;
ethtool_convert_link_mode_to_legacy_u32(&advertising,
ep->link_modes.advertising);
if (ep)
ethtool_convert_link_mode_to_legacy_u32(
&advertising, ep->link_modes.advertising);
if (gp->phy_type != phy_mii_mdio0 &&
gp->phy_type != phy_mii_mdio1)