linux-kernel - [PATCH] netfilter: ipset: do not call ipset_nest_end after nla_nest

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Date:   Mon, 26 Nov 2018 18:42:10 +0800
From:   Pan Bian <bianpan2016@....com>
To:     Pablo Neira Ayuso <pablo@...filter.org>,
        Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>,
        Florian Westphal <fw@...len.de>,
        "David S. Miller" <davem@...emloft.net>
Cc:     Stefano Brivio <sbrivio@...hat.com>,
        netfilter-devel@...r.kernel.org, coreteam@...filter.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Pan Bian <bianpan2016@....com>
Subject: [PATCH] netfilter: ipset: do not call ipset_nest_end after nla_nest_cancel

In the error handling block, nla_nest_cancel(skb, atd) is called to
cancel the nest operation. But then, ipset_nest_end(skb, atd) is
unexpected called to end the nest operation. This patch calls the
ipset_nest_end only on the branch that nla_nest_cancel is
not called.

Fixes: 45040978c89("netfilter: ipset: Fix set:list type crash when
flush/dump set in parallel")

Signed-off-by: Pan Bian <bianpan2016@....com>
---
 net/netfilter/ipset/ip_set_list_set.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/netfilter/ipset/ip_set_list_set.c b/net/netfilter/ipset/ip_set_list_set.c
index 4eef55d..8da228d 100644
--- a/net/netfilter/ipset/ip_set_list_set.c
+++ b/net/netfilter/ipset/ip_set_list_set.c
@@ -531,8 +531,8 @@ list_set_list(const struct ip_set *set,
 		ret = -EMSGSIZE;
 	} else {
 		cb->args[IPSET_CB_ARG0] = i;
+		ipset_nest_end(skb, atd);
 	}
-	ipset_nest_end(skb, atd);
 out:
 	rcu_read_unlock();
 	return ret;
-- 
2.7.4