[PATCH 5.9 48/75] dm: fix bug with RCU locking in dm_blk_report_zones

[Greg Kroah-Hartman]

From: Sergei Shtepa <sergei.sht...@veeam.com>

commit 89478335718c98557f10470a9bc5c555b9261c4e upstream.

The dm_get_live_table() function makes RCU read lock so
dm_put_live_table() must be called even if dm_table map is not found.

Fixes: e76239a3748c9 ("block: add a report_zones method")
Cc: sta...@vger.kernel.org
Signed-off-by: Sergei Shtepa <sergei.sht...@veeam.com>
Signed-off-by: Mike Snitzer <snit...@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 drivers/md/dm.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -491,8 +491,10 @@ static int dm_blk_report_zones(struct ge
                return -EAGAIN;
 
        map = dm_get_live_table(md, &srcu_idx);
-       if (!map)
-               return -EIO;
+       if (!map) {
+               ret = -EIO;
+               goto out;
+       }
 
        do {
                struct dm_target *tgt;