linux-kernel - [PATCH linux-next 4/4] net/dsa: fix possible NULL pointer dereference in dsa_slave_get

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Date:	Tue, 14 Apr 2015 23:20:17 +0800
From:	Honggang Li <honli@...hat.com>
To:	roland@...nel.org, sean.hefty@...el.com, hal.rosenstock@...il.com,
	kaber@...sh.net, davem@...emloft.net, alex.estrin@...el.com,
	dledford@...hat.com, edumazet@...gle.com, erezsh@...lanox.com,
	nicolas.dichtel@...nd.com, maheshb@...gle.com, jbenc@...hat.com,
	ebiederm@...ssion.com, elfring@...rs.sourceforge.net,
	f.fainelli@...il.com, linux@...ck-us.net, andrew@...n.ch,
	sfeldma@...il.com, alexander.h.duyck@...el.com,
	linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Cc:	Honggang Li <honli@...hat.com>
Subject: [PATCH linux-next 4/4] net/dsa: fix possible NULL pointer dereference in dsa_slave_get_iflink

Signed-off-by: Honggang Li <honli@...hat.com>
---
 net/dsa/slave.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index 827cda56..070b599 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -59,7 +59,10 @@ static int dsa_slave_get_iflink(const struct net_device *dev)
 {
 	struct dsa_slave_priv *p = netdev_priv(dev);
 
-	return p->parent->dst->master_netdev->ifindex;
+	if (p && p->parent && p->parent->dst && p->parent->dst->master_netdev)
+		return p->parent->dst->master_netdev->ifindex;
+	else
+		return 0;
 }
 
 static inline bool dsa_port_is_bridged(struct dsa_slave_priv *p)
-- 
1.8.3.1

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