cifs: Fix oops due to uncleared server->smbd_conn in reconnect

In smbd_destroy(), clear the server->smbd_conn pointer after freeing the
smbd_connection struct that it points to so that reconnection doesn't get
confused.

Fixes: 8ef130f ("CIFS: SMBD: Implement function to destroy a SMB Direct connection")
Cc: [email protected]
Reviewed-by: Paulo Alcantara (SUSE) <[email protected]>
Acked-by: Tom Talpey <[email protected]>
Signed-off-by: David Howells <[email protected]>
Cc: Long Li <[email protected]>
Cc: Pavel Shilovsky <[email protected]>
Cc: Ronnie Sahlberg <[email protected]>
Signed-off-by: Steve French <[email protected]>

Author: dhowells

fs/cifs/smbdirect.c

@@ -1405,6 +1405,7 @@ void smbd_destroy(struct TCP_Server_Info *server)
 	destroy_workqueue(info->workqueue);
 	log_rdma_event(INFO,  "rdma session destroyed\n");
 	kfree(info);
+	server->smbd_conn = NULL;
 }
 
 /*