[dm-devel] [PATCH] dm-integrity: fix a crash with recalculate

[Mikulas Patocka]

Fix a crash if "recalculate" is specified without "internal_hash".

Signed-off-by: Mikulas Patocka <mpatocka at redhat.com>
Cc: stable at vger.kernel.org	# v4.19+

Index: linux-2.6/drivers/md/dm-integrity.c
===================================================================
--- linux-2.6.orig/drivers/md/dm-integrity.c
+++ linux-2.6/drivers/md/dm-integrity.c
@@ -4235,6 +4235,12 @@ 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,