net: sun: sungem: rix a possible null dereference
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: 92552fdda557 ("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>
diff --git a/drivers/net/ethernet/sun/sungem.c b/drivers/net/ethernet/sun/sungem.c
index dbfca04..fa607d0 100644
--- a/drivers/net/ethernet/sun/sungem.c
+++ b/drivers/net/ethernet/sun/sungem.c
@@ -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)