dm cache: fix corruption seen when using cache > 2TB

[mirror_ubuntu-zesty-kernel.git] / drivers / md / dm-rq.c

diff --git a/drivers/md/dm-rq.c b/drivers/md/dm-rq.c
index 9d7275fb541ad422b171cbe0ee43335e3e1efc27..6e702fc69a83cb27f6bc1792d4871ad18d708f71 100644 (file)
--- a/drivers/md/dm-rq.c
+++ b/drivers/md/dm-rq.c
@@ -779,6 +779,10 @@ static void dm_old_request_fn(struct request_queue *q)
                int srcu_idx;
                struct dm_table *map = dm_get_live_table(md, &srcu_idx);
 
+               if (unlikely(!map)) {
+                       dm_put_live_table(md, srcu_idx);
+                       return;
+               }
                ti = dm_table_find_target(map, pos);
                dm_put_live_table(md, srcu_idx);
        }