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    Subject[PATCH 5.18 021/102] dm raid: fix KASAN warning in raid5_add_disks
    Date
    From: Mikulas Patocka <mpatocka@redhat.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@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/raid5.c | 1 +
    1 file changed, 1 insertion(+)

    --- a/drivers/md/raid5.c
    +++ b/drivers/md/raid5.c
    @@ -8023,6 +8023,7 @@ 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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