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Message-Id: <20220705115610.431332584@linuxfoundation.org>
Date: Tue, 5 Jul 2022 13:57:42 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Mikulas Patocka <mpatocka@...hat.com>,
Mike Snitzer <snitzer@...nel.org>
Subject: [PATCH 5.4 06/58] dm raid: fix KASAN warning in raid5_add_disks
From: Mikulas Patocka <mpatocka@...hat.com>
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@...r.kernel.org
Signed-off-by: Mikulas Patocka <mpatocka@...hat.com>
Signed-off-by: Mike Snitzer <snitzer@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
drivers/md/raid5.c | 1 +
1 file changed, 1 insertion(+)
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -7722,6 +7722,7 @@ static int raid5_add_disk(struct mddev *
*/
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;
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