From 7816a0a862d851d0b05710e7d94bfe390f3180e2 Mon Sep 17 00:00:00 2001 From: Patrick McHardy <kaber@trash.net> Date: Fri, 17 Apr 2009 15:59:23 -0700 Subject: [PATCH] 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> --- drivers/net/macvlan.c | 9 ++++++--- net/8021q/vlan_dev.c | 3 ++- 2 files changed, 8 insertions(+), 4 deletions(-) diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c index 70d3ef4a2c5f..214a8cf2b708 100644 --- 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 1b34135cf990..6b0921364014 100644 --- 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);