From e74bad6b015b732d8269a8ddfb303c9b33092722 Mon Sep 17 00:00:00 2001 From: Philippe Reynes Date: Fri, 17 Mar 2017 22:54:04 +0100 Subject: [PATCH] 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 Signed-off-by: Philippe Reynes Signed-off-by: David S. Miller --- drivers/net/ethernet/sun/sungem.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/sun/sungem.c b/drivers/net/ethernet/sun/sungem.c index dbfca0466760..fa607d062cb3 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) -- 2.20.1