diff --git a/ChangeLog b/ChangeLog
index 42483eb7..c2ef35f9 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2013-08-13  Nicolas François  <nicolas.francois@centraliens.net>
+
+	* lib/subordinateio.c: Fix handling of boundaries.
+	* libmisc/find_new_sub_uids.c: Likewise.
+	* libmisc/find_new_sub_gids.c: Likewise.
+
 2013-08-12  Nicolas François  <nicolas.francois@centraliens.net>
 
 	* lib/subordinateio.c: Fix removal of ranges. The database needs
diff --git a/lib/subordinateio.c b/lib/subordinateio.c
index 34630f2c..4e94104c 100644
--- a/lib/subordinateio.c
+++ b/lib/subordinateio.c
@@ -228,7 +228,7 @@ static unsigned long find_free_range(struct commonio_db *db,
 	unsigned long low, high;
 
 	/* When given invalid parameters fail */
-	if ((count == 0) || (max <= min))
+	if ((count == 0) || (max < min))
 		goto fail;
 
 	/* Sort by range then by owner */
@@ -246,7 +246,7 @@ static unsigned long find_free_range(struct commonio_db *db,
 			high = max;
 
 		/* Is the hole before this range large enough? */
-		if ((high > low) && (((high - low) + 1) >= count))
+		if ((high > low) && ((high - low) >= count))
 			return low;
 
 		/* Compute the low end of the next hole */
diff --git a/libmisc/find_new_sub_gids.c b/libmisc/find_new_sub_gids.c
index 1b008fbe..5d12d9ac 100644
--- a/libmisc/find_new_sub_gids.c
+++ b/libmisc/find_new_sub_gids.c
@@ -60,7 +60,7 @@ int find_new_sub_gids (const char *owner,
 	max = getdef_ulong ("SUB_GID_MAX", 600100000UL);
 	count = getdef_ulong ("SUB_GID_COUNT", 10000);
 
-	if (min >= max || count >= max || (min + count) >= max) {
+	if (min > max || count >= max || (min + count - 1) > max) {
 		(void) fprintf (stderr,
 				_("%s: Invalid configuration: SUB_GID_MIN (%lu),"
 				  " SUB_GID_MAX (%lu), SUB_GID_COUNT (%lu)\n"),
diff --git a/libmisc/find_new_sub_uids.c b/libmisc/find_new_sub_uids.c
index 35f5f90f..525408ce 100644
--- a/libmisc/find_new_sub_uids.c
+++ b/libmisc/find_new_sub_uids.c
@@ -60,7 +60,7 @@ int find_new_sub_uids (const char *owner,
 	max = getdef_ulong ("SUB_UID_MAX", 600100000UL);
 	count = getdef_ulong ("SUB_UID_COUNT", 10000);
 
-	if (min >= max || count >= max || (min + count) >= max) {
+	if (min > max || count >= max || (min + count - 1) > max) {
 		(void) fprintf (stderr,
 				_("%s: Invalid configuration: SUB_UID_MIN (%lu),"
 				  " SUB_UID_MAX (%lu), SUB_UID_COUNT (%lu)\n"),