tun: forbid iface creation with rtnl ops

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commit 35b827b6d0 upstream.

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: f019a7a594 ("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>
[bwh: Backported to 3.16: Don't use extack]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

...

This commit is contained in:

Nicolas Dichtel 2018-11-29 14:45:39 +01:00 • committed by Ben Hutchings

parent 32a57e8f41

commit 331fcda493

1 changed files with 1 additions and 3 deletions

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drivers/net/tun.c

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