diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index 7d860a22e5fb..0cddc35e1e87 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -1009,10 +1009,14 @@ static int netlink_bind(struct socket *sock, struct sockaddr *addr,
 			return err;
 	}
 
-	if (nlk->ngroups == 0)
+	if (nlk->ngroups == 0) {
 		groups = 0;
-	else
+	} else {
+		if (groups != (groups & ((1ULL << nlk->ngroups) - 1)))
+			pr_alert("%s: groups: %#lx ngroups: %u\n",
+				current->comm, groups, nlk->ngroups);
 		groups &= (1ULL << nlk->ngroups) - 1;
+	}
 
 	bound = nlk->bound;
 	if (bound) {