linux-kernel - [PATCH 4.16 07/48] cls_flower: Fix incorrect idr release when failing to modify rule

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Message-Id: <20180609145948.147600514@linuxfoundation.org>
Date:   Sat,  9 Jun 2018 17:29:19 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Vlad Buslov <vladbu@...lanox.com>,
        Roi Dayan <roid@...lanox.com>, Jiri Pirko <jiri@...lanox.com>,
        Paul Blakey <paulb@...lanox.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.16 07/48] cls_flower: Fix incorrect idr release when failing to modify rule

4.16-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Paul Blakey <paulb@...lanox.com>

[ 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@...lanox.com>
Reviewed-by: Roi Dayan <roid@...lanox.com>
Acked-by: Jiri Pirko <jiri@...lanox.com>
Signed-off-by: Paul Blakey <paulb@...lanox.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 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
@@ -974,7 +974,7 @@ 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);