diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index ce1adb6a53b1200225a693745542c28c67b4938b..758da34fb27d3a4c8e2ec30b1a1d8c075eb45574 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -7997,6 +7997,7 @@ static int raid5_add_disk(struct mddev *mddev, struct md_rdev *rdev)
 	 */
 	if (rdev->saved_raid_disk >= 0 &&
 	    rdev->saved_raid_disk >= first &&
+	    rdev->saved_raid_disk <= last &&
 	    conf->disks[rdev->saved_raid_disk].rdev == NULL)
 		first = rdev->saved_raid_disk;