[PATCH 4.14 162/229] dm raid: fix address sanitizer warning in raid_resume

Greg Kroah-Hartman
2022-08-23T10:08:47Z

From: Mikulas Patocka <mpatocka@redhat.com>

commit 7dad24db59d2d2803576f2e3645728866a056dab upstream.

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.

Cc: stable@vger.kernel.org
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/md/dm-raid.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/md/dm-raid.c
+++ b/drivers/md/dm-raid.c
@@ -3669,7 +3669,7 @@ 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))