diff options
| author | Nicolas Dichtel <nicolas.dichtel@6wind.com> | 2018-11-29 14:45:39 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-12-17 09:38:31 +0100 |
| commit | b28c2c74a50374a5e8a4fbe605f6095adebbe252 (patch) | |
| tree | 0fa04cc7699f65feb4a130b1615a331f2e43de52 /drivers/net/tun.c | |
| parent | bd3fa7e1a6032de0cb59a1532f4da8c385660824 (diff) | |
tun: forbid iface creation with rtnl ops
[ Upstream commit 35b827b6d06199841a83839e8bb69c0cd13a28be ]
It's not supported right now (the goal of the initial patch was to support
'ip link del' only).
Before the patch:
$ ip link add foo type tun
[ 239.632660] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
[snip]
[ 239.636410] RIP: 0010:register_netdevice+0x8e/0x3a0
This panic occurs because dev->netdev_ops is not set by tun_setup(). But to
have something usable, it will require more than just setting
netdev_ops.
Fixes: f019a7a594d9 ("tun: Implement ip link del tunXXX")
CC: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/net/tun.c')
| -rw-r--r-- | drivers/net/tun.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/net/tun.c b/drivers/net/tun.c index 0260bc15bc0c..7a0d5e928bec 100644 --- a/drivers/net/tun.c +++ b/drivers/net/tun.c @@ -1570,9 +1570,9 @@ static void tun_setup(struct net_device *dev) */ static int tun_validate(struct nlattr *tb[], struct nlattr *data[]) { - if (!data) - return 0; - return -EINVAL; + /* NL_SET_ERR_MSG(extack, + "tun/tap creation via rtnetlink is not supported."); */ + return -EOPNOTSUPP; } static struct rtnl_link_ops tun_link_ops __read_mostly = { |