smb/server: fix possible refcount leak in smb2_sess_setup()

Reference count of ksmbd_session will leak when session need reconnect.
Fix this by adding the missing ksmbd_user_session_put().

Co-developed-by: ChenXiaoSong <[email protected]>
Signed-off-by: ChenXiaoSong <[email protected]>
Signed-off-by: ZhangGuoDong <[email protected]>
Acked-by: Namjae Jeon <[email protected]>
Signed-off-by: Steve French <[email protected]>

Author: ZhangGuoDong

fs/smb/server/smb2pdu.c

@@ -1806,6 +1806,7 @@ int smb2_sess_setup(struct ksmbd_work *work)
 
 		if (ksmbd_conn_need_reconnect(conn)) {
 			rc = -EFAULT;
+			ksmbd_user_session_put(sess);
 			sess = NULL;
 			goto out_err;
 		}