diff options
| author | Eric Dumazet <eric.dumazet@gmail.com> | 2009-10-26 01:23:33 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-10-28 03:59:46 -0700 |
| commit | ac5e3af9996fb911d4fdff910a8ac3cb7fc63a94 (patch) | |
| tree | c6c56403289c8bff16884592dc76d276444e9f04 | |
| parent | b75c6dbb45a49289b90f885c7fb6d9ac39a21688 (diff) | |
net: sysfs: ethtool_ops can be NULL
commit d519e17e2d01a0ee9abe083019532061b4438065
(net: export device speed and duplex via sysfs)
made the wrong assumption that netdev->ethtool_ops was always set.
This makes possible to crash kernel and let rtnl in locked state.
modprobe dummy
ip link set dummy0 up
(udev runs and crash)
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Acked-by: Andy Gospodarek <andy@greyhouse.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/core/net-sysfs.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c index 753c420060d..89de182353b 100644 --- a/net/core/net-sysfs.c +++ b/net/core/net-sysfs.c @@ -139,7 +139,9 @@ static ssize_t show_speed(struct device *dev, if (!rtnl_trylock()) return restart_syscall(); - if (netif_running(netdev) && netdev->ethtool_ops->get_settings) { + if (netif_running(netdev) && + netdev->ethtool_ops && + netdev->ethtool_ops->get_settings) { struct ethtool_cmd cmd = { ETHTOOL_GSET }; if (!netdev->ethtool_ops->get_settings(netdev, &cmd)) @@ -158,7 +160,9 @@ static ssize_t show_duplex(struct device *dev, if (!rtnl_trylock()) return restart_syscall(); - if (netif_running(netdev) && netdev->ethtool_ops->get_settings) { + if (netif_running(netdev) && + netdev->ethtool_ops && + netdev->ethtool_ops->get_settings) { struct ethtool_cmd cmd = { ETHTOOL_GSET }; if (!netdev->ethtool_ops->get_settings(netdev, &cmd)) |