tipc: withdraw tipc topology server name when namespace is deleted

The TIPC topology server is a per namespace service associated with the
tipc name {1, 1}. When a namespace is deleted, that name must be withdrawn
before we call sk_release_kernel because the kernel socket release is
done in init_net and trying to withdraw a TIPC name published in another
namespace will fail with an error as:

[  170.093264] Unable to remove local publication
[  170.093264] (type=1, lower=1, ref=2184244004, key=2184244005)

We fix this by breaking the association between the topology server name
and socket before calling sk_release_kernel.

Signed-off-by: Ying Xue <ying.xue@windriver.com>
Reviewed-by: Erik Hugne <erik.hugne@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 0 deletions

diff --git a/net/tipc/server.c b/net/tipc/server.c
index a57c8407cbf3..ab6183cdb121 100644
--- a/net/tipc/server.c
+++ b/net/tipc/server.c
@@ -90,6 +90,7 @@ static void tipc_clean_outqueues(struct tipc_conn *con);
 static void tipc_conn_kref_release(struct kref *kref)
 {
         struct tipc_conn *con = container_of(kref, struct tipc_conn, kref);
+        struct sockaddr_tipc *saddr = con->server->saddr;
         struct socket *sock = con->sock;
         struct sock *sk;
 
@@ -99,6 +100,8 @@ static void tipc_conn_kref_release(struct kref *kref)
                         __module_get(sock->ops->owner);
                         __module_get(sk->sk_prot_creator->owner);
                 }
+                saddr->scope = -TIPC_NODE_SCOPE;
+                kernel_bind(sock, (struct sockaddr *)saddr, sizeof(*saddr));
                 sk_release_kernel(sk);
                 con->sock = NULL;
         }