netdev - [PATCH AUTOSEL 5.4 002/108] netfilter: ctnetlink: be more strict when NF_CONNTRACK

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Date:   Sat, 11 Apr 2020 19:07:57 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Romain Bellan <romain.bellan@...irst.fr>,
        Florent Fourcot <florent.fourcot@...irst.fr>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Sasha Levin <sashal@...nel.org>,
        netfilter-devel@...r.kernel.org, coreteam@...filter.org,
        netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 5.4 002/108] netfilter: ctnetlink: be more strict when NF_CONNTRACK_MARK is not set

From: Romain Bellan <romain.bellan@...irst.fr>

[ Upstream commit 7c6b4121627aeaa79536fbb900feafec740410d3 ]

When CONFIG_NF_CONNTRACK_MARK is not set, any CTA_MARK or CTA_MARK_MASK
in netlink message are not supported. We should return an error when one
of them is set, not both

Fixes: 9306425b70bf ("netfilter: ctnetlink: must check mark attributes vs NULL")
Signed-off-by: Romain Bellan <romain.bellan@...irst.fr>
Signed-off-by: Florent Fourcot <florent.fourcot@...irst.fr>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/netfilter/nf_conntrack_netlink.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index aa8adf930b3ce..bb9c7569b9729 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -838,7 +838,7 @@ ctnetlink_alloc_filter(const struct nlattr * const cda[], u8 family)
 	struct ctnetlink_filter *filter;
 
 #ifndef CONFIG_NF_CONNTRACK_MARK
-	if (cda[CTA_MARK] && cda[CTA_MARK_MASK])
+	if (cda[CTA_MARK] || cda[CTA_MARK_MASK])
 		return ERR_PTR(-EOPNOTSUPP);
 #endif
 
-- 
2.20.1