[PATCH linux-next 3/4] macvlan: fix possible NULL pointer dereference in macvlan_dev_get_iflink

[Honggang Li]

Signed-off-by: Honggang Li <honli@xxxxxxxxxx>
---
 drivers/net/macvlan.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index b227a13..1e59f39 100644
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -998,7 +998,9 @@ static int macvlan_dev_get_iflink(const struct net_device *dev)
 {
 	struct macvlan_dev *vlan = netdev_priv(dev);
 
-	return vlan->lowerdev->ifindex;
+	if (vlan && vlan->lowerdev)
+		return vlan->lowerdev->ifindex;
+	return 0;
 }
 
 static const struct ethtool_ops macvlan_ethtool_ops = {
-- 
1.8.3.1

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