[PATCH v2 1/2] tipc: skip socketless connections in topsrv teardown

["Jérémy Jean" <Jeremy.Jean@oss.cyber.gouv.fr>]

Kernel subscription connections have no socket but can remain in conn_idr
after unsubscribe while send work is pending. 

Skip tipc_conn_close() for these entries to avoid a NULL dereference
during netns teardown.

Fixes: e88f2be83282 ("tipc: fix race condition at topology server receive")
Cc: stable@vger.kernel.org
Assisted-by: LLM
Signed-off-by: Jérémy Jean <Jeremy.Jean@oss.cyber.gouv.fr>
---
 net/tipc/topsrv.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/tipc/topsrv.c b/net/tipc/topsrv.c
index af530c9..01dd34b 100644
--- a/net/tipc/topsrv.c
+++ b/net/tipc/topsrv.c
@@ -706,7 +706,8 @@ static void tipc_topsrv_stop(struct net *net)
 		if (con) {
 			conn_get(con);
 			spin_unlock_bh(&srv->idr_lock);
-			tipc_conn_close(con);
+			if (con->sock)
+				tipc_conn_close(con);
 			conn_put(con);
 			spin_lock_bh(&srv->idr_lock);
 		}
-- 
2.47.3