linux-kernel - [PATCH 3.16.y-ckt 120/129] netfilter: nf_tables: fix error handling of rule replacement

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Message-Id: <1432285114-9254-121-git-send-email-luis.henriques@canonical.com>
Date:	Fri, 22 May 2015 09:58:25 +0100
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Pablo Neira Ayuso <pablo@...filter.org>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 120/129] netfilter: nf_tables: fix error handling of rule replacement

3.16.7-ckt12 -stable review patch.  If anyone has any objections, please let me know.

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

From: Pablo Neira Ayuso <pablo@...filter.org>

commit 59900e0a019e7c2bdb7809a03ed5742d311b15b3 upstream.

In general, if a transaction object is added to the list successfully,
we can rely on the abort path to undo what we've done. This allows us to
simplify the error handling of the rule replacement path in
nf_tables_newrule().

This implicitly fixes an unnecessary removal of the old rule, which
needs to be left in place if we fail to replace.

Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 net/netfilter/nf_tables_api.c | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index e1cf0f89748d..e8624c751ec6 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -1857,12 +1857,6 @@ static int nf_tables_newrule(struct sock *nlsk, struct sk_buff *skb,
 
 err3:
 	list_del_rcu(&rule->list);
-	if (trans) {
-		list_del_rcu(&nft_trans_rule(trans)->list);
-		nft_rule_clear(net, nft_trans_rule(trans));
-		nft_trans_destroy(trans);
-		chain->use++;
-	}
 err2:
 	nf_tables_rule_destroy(&ctx, rule);
 err1:
--
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