super: move lockdep assert

Fix braino and move the lockdep assertion after put_super() otherwise we
risk a use-after-free.

Fixes: 2c18a63 ("super: wait until we passed kill super")
Reviewed-by: Jan Kara <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>
Message-Id: <[email protected]>
Signed-off-by: Christian Brauner <[email protected]>

Author: brauner

fs/super.c

@@ -570,8 +570,8 @@ static bool grab_super_dead(struct super_block *sb)
 		return true;
 	}
 	wait_var_event(&sb->s_flags, wait_dead(sb));
-	put_super(sb);
 	lockdep_assert_not_held(&sb->s_umount);
+	put_super(sb);
 	return false;
 }