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From: Pablo Neira Ayuso <pablo@netfilter.org>
To: netfilter-devel@vger.kernel.org
Cc: davem@davemloft.net, netdev@vger.kernel.org
Subject: [PATCH 9/9] netfilter: nf_tables: add missing ->release_ops() in error path of newrule()
Date: Thu, 21 Mar 2019 12:28:45 +0100
Message-ID: <20190321112845.10627-10-pablo@netfilter.org> (raw)
In-Reply-To: <20190321112845.10627-1-pablo@netfilter.org>

From: Taehee Yoo <ap420073@gmail.com>

->release_ops() callback releases resources and this is used in error path.
If nf_tables_newrule() fails after ->select_ops(), it should release
resources. but it can not call ->destroy() because that should be called
after ->init().
At this point, ->release_ops() should be used for releasing resources.

Test commands:
   modprobe -rv xt_tcpudp
   iptables-nft -I INPUT -m tcp   <-- error command
   lsmod

Result:
   Module                  Size  Used by
   xt_tcpudp              20480  2      <-- it should be 0

Fixes: b8e204006340 ("netfilter: nft_compat: use .release_ops and remove list of extension")
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 net/netfilter/nf_tables_api.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 513f93118604..ef7772e976cc 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -2806,8 +2806,11 @@ static int nf_tables_newrule(struct net *net, struct sock *nlsk,
 	nf_tables_rule_release(&ctx, rule);
 err1:
 	for (i = 0; i < n; i++) {
-		if (info[i].ops != NULL)
+		if (info[i].ops) {
 			module_put(info[i].ops->type->owner);
+			if (info[i].ops->type->release_ops)
+				info[i].ops->type->release_ops(info[i].ops);
+		}
 	}
 	kvfree(info);
 	return err;
-- 
2.11.0


  parent reply index

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-21 11:28 [PATCH 0/9] Netfilter fixes for net Pablo Neira Ayuso
2019-03-21 11:28 ` [PATCH 1/9] netfilter: nf_conntrack_sip: remove direct dependency on IPv6 Pablo Neira Ayuso
2019-03-21 11:28 ` [PATCH 2/9] netfilter: nft_set_rbtree: check for inactive element after flag mismatch Pablo Neira Ayuso
2019-03-21 11:28 ` [PATCH 3/9] netfilter: bridge: set skb transport_header before entering NF_INET_PRE_ROUTING Pablo Neira Ayuso
2019-03-21 11:28 ` [PATCH 4/9] netfilter: fix NETFILTER_XT_TARGET_TEE dependencies Pablo Neira Ayuso
2019-03-21 11:28 ` [PATCH 5/9] netfilter: ip6t_srh: fix NULL pointer dereferences Pablo Neira Ayuso
2019-03-21 11:28 ` [PATCH 6/9] netfilter: nf_tables: bogus EBUSY in helper removal from transaction Pablo Neira Ayuso
2019-03-21 11:28 ` [PATCH 7/9] netfilter: nft_redir: fix module autoload with ip4 Pablo Neira Ayuso
2019-03-21 11:28 ` [PATCH 8/9] netfilter: nf_flowtable: remove duplicated transition in diagram Pablo Neira Ayuso
2019-03-21 11:28 ` Pablo Neira Ayuso [this message]
2019-03-21 17:07 ` [PATCH 0/9] Netfilter fixes for net David Miller

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