[NET]: fix oops after tunnel module unload

[mirror_ubuntu-focal-kernel.git] / net / ipv6 / sit.c

diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index b788f55e139b80756e23ef024335c3d2024d9f63..e553e5b80d6e3ed78124073c5163ec17dc0143b6 100644 (file)
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -195,7 +195,6 @@ static struct ip_tunnel * ipip6_tunnel_locate(struct ip_tunnel_parm *parms, int
        dev_hold(dev);
 
        ipip6_tunnel_link(nt);
-       /* Do not decrement MOD_USE_COUNT here. */
        return nt;
 
 failed:
@@ -794,10 +793,28 @@ static struct net_protocol sit_protocol = {
        .err_handler    =       ipip6_err,
 };
 
+static void __exit sit_destroy_tunnels(void)
+{
+       int prio;
+
+       for (prio = 1; prio < 4; prio++) {
+               int h;
+               for (h = 0; h < HASH_SIZE; h++) {
+                       struct ip_tunnel *t;
+                       while ((t = tunnels[prio][h]) != NULL)
+                               unregister_netdevice(t->dev);
+               }
+       }
+}
+
 void __exit sit_cleanup(void)
 {
        inet_del_protocol(&sit_protocol, IPPROTO_IPV6);
-       unregister_netdev(ipip6_fb_tunnel_dev);
+
+       rtnl_lock();
+       sit_destroy_tunnels();
+       unregister_netdevice(ipip6_fb_tunnel_dev);
+       rtnl_unlock();
 }
 
 int __init sit_init(void)