From: Jakub Kicinski <kuba@xxxxxxxxxx>
[ Upstream commit 47e4bb147a96f1c9b4e7691e7e994e53838bfff8 ]
We need to unregister the netdevice if config failed.
.ndo_uninit takes care of most of the heavy lifting.
This was uncovered by recent commit c269a24ce057 ("net: make
free_netdev() more lenient with unregistering devices").
Previously the partially-initialized device would be left
in the system.
Reported-and-tested-by: syzbot+2393580080a2da190f04@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: e2f1f072db8d ("sit: allow to configure 6rd tunnels via netlink")
Acked-by: Nicolas Dichtel <nicolas.dichtel@xxxxxxxxx>
Link: https://lore.kernel.org/r/20210114012947.2515313-1-kuba@xxxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/ipv6/sit.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -1645,8 +1645,11 @@ static int ipip6_newlink(struct net *src
}
#ifdef CONFIG_IPV6_SIT_6RD
- if (ipip6_netlink_6rd_parms(data, &ip6rd))
+ if (ipip6_netlink_6rd_parms(data, &ip6rd)) {
err = ipip6_tunnel_update_6rd(nt, &ip6rd);
+ if (err < 0)
+ unregister_netdevice_queue(dev, NULL);
+ }
#endif
return err;
