[PATCH] DM RAID: Fix comparison of index and quantity for "rebuild" parameter

DM RAID: Fix comparison of index and quantity for "rebuild" parameter

The "rebuild" parameter takes an index argument that starts counting from
zero.  The conditional used to validate the index was using '>' rather than
'>=', leaving the door open for an index value that would be 1 too large.

Reported-by: Neil Brown <redacted>
Signed-off-by: Jonathan Brassow <redacted>

Index: linux-upstream/drivers/md/dm-raid.c
===================================================================

--- linux-upstream.orig/drivers/md/dm-raid.c
+++ linux-upstream/drivers/md/dm-raid.c

@@ -539,7 +539,7 @@ static int parse_raid_params(struct raid
 
 		/* Parameters that take a numeric value are checked here */
 		if (!strcasecmp(key, "rebuild")) {
-			if (value > rs->md.raid_disks) {
+			if (value >= rs->md.raid_disks) {
 				rs->ti->error = "Invalid rebuild index given";
 				return -EINVAL;
 			}