--- a/net/kcm/kcmsock.c	2022-08-21 19:03:53.088383700 +0800
+++ b/net/kcm/kcmsock.c	2022-08-21 19:23:43.935799700 +0800
@@ -1425,11 +1425,11 @@ static int kcm_attach(struct socket *soc
 	 */
 	if (csk->sk_user_data) {
 		write_unlock_bh(&csk->sk_callback_lock);
+		release_sock(csk);
 		strp_stop(&psock->strp);
 		strp_done(&psock->strp);
 		kmem_cache_free(kcm_psockp, psock);
-		err = -EALREADY;
-		goto out;
+		return -EALREADY;
 	}
 
 	psock->save_data_ready = csk->sk_data_ready;