cls_flower: Fix incorrect idr release when failing to modify rule

[ Upstream commit 8258d2da9f9f521dce7019e018360c28d116354e ]

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c
index 7a838d1..1879665 100644 (file)
--- a/net/sched/cls_flower.c
+++ b/net/sched/cls_flower.c
@@ -1007,7 +1007,7 @@ static int fl_change(struct net *net, struct sk_buff *in_skb,
        return 0;
 
 errout_idr:
-       if (fnew->handle)
+       if (!fold)
                idr_remove_ext(&head->handle_idr, fnew->handle);
 errout:
        tcf_exts_destroy(&fnew->exts);