linux-kernel - [PATCH 3.12 02/83] net: mv643xx_eth: potential NULL dereference in probe()

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Date:	Fri,  6 Dec 2013 13:50:52 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 3.12 02/83] net: mv643xx_eth: potential NULL dereference in probe()

3.12-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Dan Carpenter <dan.carpenter@...cle.com>

upstream commit 6115c11fe1a5a636ac99fc823b00df4ff3c0674e

We assume that "mp->phy" can be NULL a couple lines before the
dereference.

Fixes: 1cce16d37d0f ('net: mv643xx_eth: Add missing phy_addr_set in DT mode')
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Acked-by: Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Acked-by: Jason Gunthorpe <jgunthorpe@...idianresearch.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/marvell/mv643xx_eth.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/net/ethernet/marvell/mv643xx_eth.c
+++ b/drivers/net/ethernet/marvell/mv643xx_eth.c
@@ -2890,7 +2890,8 @@ static int mv643xx_eth_probe(struct plat
 					 PHY_INTERFACE_MODE_GMII);
 		if (!mp->phy)
 			err = -ENODEV;
-		phy_addr_set(mp, mp->phy->addr);
+		else
+			phy_addr_set(mp, mp->phy->addr);
 	} else if (pd->phy_addr != MV643XX_ETH_PHY_NONE) {
 		mp->phy = phy_scan(mp, pd->phy_addr);
 


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