Commit 617b3658 authored by Mikulas Patocka's avatar Mikulas Patocka Committed by Mike Snitzer
Browse files

dm raid: fix KASAN warning in raid5_add_disks 



There's a KASAN warning in raid5_add_disk when running the LVM testsuite.
The warning happens in the test
lvconvert-raid-reshape-linear_to_raid6-single-type.sh. We fix the warning
by verifying that rdev->saved_raid_disk is within limits.

Cc: stable@vger.kernel.org
Signed-off-by: default avatarMikulas Patocka <mpatocka@redhat.com>
Signed-off-by: default avatarMike Snitzer <snitzer@kernel.org>
parent 1ebc2cec

drivers/md/raid5.c

+1 −0
Original line number Diff line number Diff line
@@ -8065,6 +8065,7 @@ 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;