vlan/macvlan: fix NULL pointer dereferences in ethtool handlers

Check whether the underlying device provides a set of ethtool ops before
checking for individual handlers to avoid NULL pointer dereferences.

Reported-by: Art van Breemen <ard@telegraafnet.nl>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index 70d3ef4..214a8cf 100644 (file)
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -376,7 +376,8 @@ static u32 macvlan_ethtool_get_rx_csum(struct net_device *dev)
        const struct macvlan_dev *vlan = netdev_priv(dev);
        struct net_device *lowerdev = vlan->lowerdev;
 
-       if (lowerdev->ethtool_ops->get_rx_csum == NULL)
+       if (lowerdev->ethtool_ops == NULL ||
+           lowerdev->ethtool_ops->get_rx_csum == NULL)
                return 0;
        return lowerdev->ethtool_ops->get_rx_csum(lowerdev);
 }
@@ -387,7 +388,8 @@ static int macvlan_ethtool_get_settings(struct net_device *dev,
        const struct macvlan_dev *vlan = netdev_priv(dev);
        struct net_device *lowerdev = vlan->lowerdev;
 
-       if (!lowerdev->ethtool_ops->get_settings)
+       if (!lowerdev->ethtool_ops ||
+           !lowerdev->ethtool_ops->get_settings)
                return -EOPNOTSUPP;
 
        return lowerdev->ethtool_ops->get_settings(lowerdev, cmd);
@@ -398,7 +400,8 @@ static u32 macvlan_ethtool_get_flags(struct net_device *dev)
        const struct macvlan_dev *vlan = netdev_priv(dev);
        struct net_device *lowerdev = vlan->lowerdev;
 
-       if (!lowerdev->ethtool_ops->get_flags)
+       if (!lowerdev->ethtool_ops ||
+           !lowerdev->ethtool_ops->get_flags)
                return 0;
        return lowerdev->ethtool_ops->get_flags(lowerdev);
 }

diff --git a/net/8021q/vlan_dev.c b/net/8021q/vlan_dev.c
index 1b34135..6b09213 100644 (file)
--- a/net/8021q/vlan_dev.c
+++ b/net/8021q/vlan_dev.c
@@ -668,7 +668,8 @@ static int vlan_ethtool_get_settings(struct net_device *dev,
        const struct vlan_dev_info *vlan = vlan_dev_info(dev);
        struct net_device *real_dev = vlan->real_dev;
 
-       if (!real_dev->ethtool_ops->get_settings)
+       if (!real_dev->ethtool_ops ||
+           !real_dev->ethtool_ops->get_settings)
                return -EOPNOTSUPP;
 
        return real_dev->ethtool_ops->get_settings(real_dev, cmd);