D53771.1791357532.diff
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	diff --git a/usr.bin/mdo/mdo.c b/usr.bin/mdo/mdo.c
	--- a/usr.bin/mdo/mdo.c
	+++ b/usr.bin/mdo/mdo.c
	@@ -753,8 +753,14 @@
	*/
	setcred_flags \|= SETCREDF_SUPP_GROUPS;
	}
	- } else if (supp_groups_str == NULL && (supp_mod_str == NULL \|\|
	- supp_mod_str[0] != '@')) {
	+ } else if (supp_groups_str == NULL && supp_mod_str != NULL &&
	+ supp_mod_str[0] != '@') {
	+ /*
	+ * We do not need to determine the current groups if, as for the
	+ * '!start_from_current_groups' case, we are going to replace
	+ * them entirely, but here also if we do not amend them at all
	+ * (because they are by definition already in place).
	+ */
	const int ngroups = getgroups(0, NULL);

	if (ngroups > 0) {