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dm raid: fix KASAN warning in raid5_add_disks

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commit 617b365872a247480e9dcd50a32c8d1806b21861 upstream.

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: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mikulas Patocka 2022-06-29 13:40:57 -04:00 committed by Greg Kroah-Hartman
parent 90de153575
commit f157bd9cf3
1 changed files with 1 additions and 0 deletions
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drivers/md/raid5.c
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@ -7722,6 +7722,7 @@ static int raid5_add_disk(struct mddev *mddev, struct md_rdev *rdev)
*/ */
if (rdev->saved_raid_disk >= 0 && if (rdev->saved_raid_disk >= 0 &&
rdev->saved_raid_disk >= first && rdev->saved_raid_disk >= first &&
rdev->saved_raid_disk <= last &&
conf->disks[rdev->saved_raid_disk].rdev == NULL) conf->disks[rdev->saved_raid_disk].rdev == NULL)
first = rdev->saved_raid_disk; first = rdev->saved_raid_disk;