linux-kernel - [PATCH] net: sun: sungem: rix a possible null dereference

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Message-Id: <1489526601-9423-1-git-send-email-tremyfr@gmail.com>
Date:   Tue, 14 Mar 2017 22:23:21 +0100
From:   Philippe Reynes <tremyfr@...il.com>
To:     davem@...emloft.net, mugunthanvnm@...com, jarod@...hat.com,
        felipe.balbi@...ux.intel.com, edumazet@...gle.com, fw@...len.de,
        dan.carpenter@...cle.com
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Philippe Reynes <tremyfr@...il.com>
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.

This issue was added by the patch 92552fdd557:
"net: sun: sungem: use new api ethtool_{get|set}_link_ksettings".

Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Philippe Reynes <tremyfr@...il.com>
---
 drivers/net/ethernet/sun/sungem.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

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)
-- 
1.7.4.4