From a08121c978f17e834e852802e7516b0aba6344e6 Mon Sep 17 00:00:00 2001
From: Vladislav Vaintroub <wlad@mariadb.com>
Date: Thu, 15 Feb 2018 17:40:14 +0000
Subject: [PATCH] MDEV-14997 mariabackup crashes with invalid
 --innodb-flush-method

Avoid NULL pointer dereference when shutting down after invalid parameters
were parsed.
---
 extra/mariabackup/xtrabackup.cc | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/extra/mariabackup/xtrabackup.cc b/extra/mariabackup/xtrabackup.cc
index 7ac168b1778..18c7474a2e8 100644
--- a/extra/mariabackup/xtrabackup.cc
+++ b/extra/mariabackup/xtrabackup.cc
@@ -3569,7 +3569,9 @@ xtrabackup_backup_func()
         if(innodb_init_param()) {
 fail:
 		stop_backup_threads();
-		innodb_shutdown();
+		if (fil_system) {
+			innodb_shutdown();
+		}
 		return(false);
 	}