[PATCH 5.4 14/86] dm integrity: fix a crash if "recalculate" used without "internal_hash"

[Greg Kroah-Hartman]

From: Mikulas Patocka <mpato...@redhat.com>

commit 2d06dfecb132a1cc2e374a44eae83b5c4356b8b4 upstream.

Recalculate can only be specified with internal_hash.

Cc: sta...@vger.kernel.org # v4.19+
Signed-off-by: Mikulas Patocka <mpato...@redhat.com>
Signed-off-by: Mike Snitzer <snit...@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

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

--- a/drivers/md/dm-integrity.c
+++ b/drivers/md/dm-integrity.c
@@ -4059,6 +4059,12 @@ try_smaller_buffer:
                        r = -ENOMEM;
                        goto bad;
                }
+       } else {
+               if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING)) {
+                       ti->error = "Recalculate can only be specified with 
internal_hash";
+                       r = -EINVAL;
+                       goto bad;
+               }
        }
 
        ic->bufio = dm_bufio_client_create(ic->meta_dev ? ic->meta_dev->bdev : 
ic->dev->bdev,