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    Subject[PATCH 5.15 028/177] dm btree remove: fix use after free in rebalance_children()
    Date
    From: Joe Thornber <ejt@redhat.com>

    commit 1b8d2789dad0005fd5e7d35dab26a8e1203fb6da upstream.

    Move dm_tm_unlock() after dm_tm_dec().

    Cc: stable@vger.kernel.org
    Signed-off-by: Joe Thornber <ejt@redhat.com>
    Signed-off-by: Mike Snitzer <snitzer@redhat.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    drivers/md/persistent-data/dm-btree-remove.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/drivers/md/persistent-data/dm-btree-remove.c
    +++ b/drivers/md/persistent-data/dm-btree-remove.c
    @@ -423,9 +423,9 @@ static int rebalance_children(struct sha

    memcpy(n, dm_block_data(child),
    dm_bm_block_size(dm_tm_get_bm(info->tm)));
    - dm_tm_unlock(info->tm, child);

    dm_tm_dec(info->tm, dm_block_location(child));
    + dm_tm_unlock(info->tm, child);
    return 0;
    }


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