[PATCH 4.19 15/22] net: sit: unregister_netdevice on newlinks error path

[Greg Kroah-Hartman]

From: Jakub Kicinski <k...@kernel.org>

[ 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+2393580080a2da190...@syzkaller.appspotmail.com
Fixes: e2f1f072db8d ("sit: allow to configure 6rd tunnels via netlink")
Acked-by: Nicolas Dichtel <nicolas.dich...@6wind.com>
Link: https://lore.kernel.org/r/20210114012947.2515313-1-k...@kernel.org
Signed-off-by: Jakub Kicinski <k...@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 net/ipv6/sit.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -1596,8 +1596,11 @@ 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;