dm space map common: add bounds check to sm_ll_lookup_bitmap()

stable inclusion
from linux-4.19.226
commit 7d585b602a5c054e810b8f47183069872ac2fdf6

--------------------------------

[ Upstream commit cba23ac1 ]

Corrupted metadata could warrant returning error from sm_ll_lookup_bitmap().

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Yongqiang Liu <liuyongqiang13@huawei.com>
Signed-off-by: Laibin Qiu <qiulaibin@huawei.com>