[PATCH AUTOSEL 5.6 003/149] netfilter: ctnetlink: be more strict when NF_CONNTRACK_MARK is not set

From: Sasha Levin
Date: Sat Apr 11 2020 - 19:03:59 EST


From: Romain Bellan <romain.bellan@xxxxxxxxxx>

[ 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@xxxxxxxxxx>
Signed-off-by: Florent Fourcot <florent.fourcot@xxxxxxxxxx>
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
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 6a1c8f1f61718..7f5258ae1218a 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -860,7 +860,7 @@ 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