From: Paul Blakey <paulb@mellanox.com>
Date: Wed, 30 May 2018 11:29:15 +0300
Subject: cls_flower: Fix incorrect idr release when failing to modify rule
Patch-mainline: v4.17
Git-commit: 8258d2da9f9f521dce7019e018360c28d116354e
References: bsc#1109837

When we fail to modify a rule, we incorrectly release the idr handle
of the unmodified old rule.

Fix that by checking if we need to release it.

Fixes: fe2502e49b58 ("net_sched: remove cls_flower idr on failure")
Reported-by: Vlad Buslov <vladbu@mellanox.com>
Reviewed-by: Roi Dayan <roid@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: Paul Blakey <paulb@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 net/sched/cls_flower.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/sched/cls_flower.c
+++ b/net/sched/cls_flower.c
@@ -976,7 +976,7 @@ static int fl_change(struct net *net, st
 	return 0;
 
 errout_idr:
-	if (fnew->handle)
+	if (!fold)
 		idr_remove(&head->handle_idr, fnew->handle);
 errout:
 	tcf_exts_destroy(&fnew->exts);