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vlan/macvlan: fix NULL pointer dereferences in ethtool handlers

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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>
This commit is contained in:
Patrick McHardy
2009-04-17 15:59:23 -07:00
committed by David S. Miller
parent 75a241f959
commit 7816a0a862
2 changed files with 8 additions and 4 deletions
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9
drivers/net/macvlan.c
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@@ -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);
}