[dm-devel] [PATCH] dm-raid: fix address sanitizer warning in raid_resume

[Mikulas Patocka]

There is a KASAN warning in raid_resume when running the lvm test
lvconvert-raid.sh. The reason for the warning is that mddev->raid_disks is
greater than rs->raid_disks, so the loop touches one entry beyond the
allocated length.

Signed-off-by: Mikulas Patocka <mpatocka at redhat.com>
Cc: stable at vger.kernel.org

---
 drivers/md/dm-raid.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-2.6/drivers/md/dm-raid.c
===================================================================
--- linux-2.6.orig/drivers/md/dm-raid.c	2022-07-23 15:22:37.000000000 +0200
+++ linux-2.6/drivers/md/dm-raid.c	2022-07-23 15:23:09.000000000 +0200
@@ -3819,7 +3819,7 @@ static void attempt_restore_of_faulty_de
 
 	memset(cleared_failed_devices, 0, sizeof(cleared_failed_devices));
 
-	for (i = 0; i < mddev->raid_disks; i++) {
+	for (i = 0; i < rs->raid_disks; i++) {
 		r = &rs->dev[i].rdev;
 		/* HM FIXME: enhance journal device recovery processing */
 		if (test_bit(Journal, &r->flags))