From 663824ef4ca927aa2b4319b69e0bfa68282ec719 Mon Sep 17 00:00:00 2001
From: Serge Hallyn <serge@hallyn.com>
Date: Sat, 22 May 2021 11:42:02 -0500
Subject: [PATCH] Fix useradd with SUB_UID_COUNT=0

Closes #298

Fix useradd when SUB_UID_COUNT=0 in login.defs.

Signed-off-by: Serge Hallyn <serge@hallyn.com>
---
 src/useradd.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/useradd.c b/src/useradd.c
index 06accb2f..9862ae55 100644
--- a/src/useradd.c
+++ b/src/useradd.c
@@ -2386,6 +2386,8 @@ int main (int argc, char **argv)
 #ifdef ENABLE_SUBIDS
 	uid_t uid_min;
 	uid_t uid_max;
+	unsigned long subuid_count;
+	unsigned long subgid_count;
 #endif
 
 	/*
@@ -2427,9 +2429,11 @@ int main (int argc, char **argv)
 #ifdef ENABLE_SUBIDS
 	uid_min = (uid_t) getdef_ulong ("UID_MIN", 1000UL);
 	uid_max = (uid_t) getdef_ulong ("UID_MAX", 60000UL);
-	is_sub_uid = sub_uid_file_present () && !rflg &&
+	subuid_count = getdef_ulong ("SUB_UID_COUNT", 65536);
+	subgid_count = getdef_ulong ("SUB_GID_COUNT", 65536);
+	is_sub_uid = subuid_count > 0 && sub_uid_file_present () && !rflg &&
 	    (!user_id || (user_id <= uid_max && user_id >= uid_min));
-	is_sub_gid = sub_gid_file_present () && !rflg &&
+	is_sub_gid = subgid_count > 0 && sub_gid_file_present () && !rflg &&
 	    (!user_id || (user_id <= uid_max && user_id >= uid_min));
 #endif				/* ENABLE_SUBIDS */
 
-- 
2.30.2