[PATCH] net: dsa: avoid null pointer dereference on p->phy

[Colin King <colin.king@canonical.com>]

From: Colin Ian King <colin.king@canonical.com>

Currently p->phy is being null checked in several places to avoid
null pointer dereferences on p->phy, however, the final call
to phy_attached_info on p->phy when p->phy will perform a null
pointer dereference. Fix this by simply moving the call into
the previous code block that is only executed if p->phy is
not null.

Detected by CoverityScan, CID#1457034 ("Dereference after null check")

Fixes: 2220943a21e2 ("phy: Centralise print about attached phy")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
 net/dsa/slave.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index 02ace7d462c4..29ab4e98639b 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -1115,10 +1115,9 @@ static int dsa_slave_phy_setup(struct net_device *slave_dev)
 				of_phy_deregister_fixed_link(port_dn);
 			return ret;
 		}
+		phy_attached_info(p->phy);
 	}
 
-	phy_attached_info(p->phy);
-
 	return 0;
 }
 
-- 
2.14.1