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-rw-r--r--drivers/md/raid1.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 4e990246225e..1d54109071cc 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -1734,6 +1734,7 @@ static int raid1_add_disk(struct mddev *mddev, struct md_rdev *rdev)
 	 */
 	if (rdev->saved_raid_disk >= 0 &&
 	    rdev->saved_raid_disk >= first &&
+	    rdev->saved_raid_disk < conf->raid_disks &&
 	    conf->mirrors[rdev->saved_raid_disk].rdev == NULL)
 		first = last = rdev->saved_raid_disk;