linux-kernel - [PATCH 4.19 18/72] netfilter: fix NETFILTER_XT_TARGET

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Date:   Thu,  2 May 2019 17:20:40 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Máté Eckl <ecklm94@...il.com>,
        Taehee Yoo <ap420073@...il.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Arnd Bergmann <arnd@...db.de>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        "Sasha Levin (Microsoft)" <sashal@...nel.org>
Subject: [PATCH 4.19 18/72] netfilter: fix NETFILTER_XT_TARGET_TEE dependencies

[ Upstream commit d1fa381033eb718df5c602f64b6e88676138dfc6 ]

With NETFILTER_XT_TARGET_TEE=y and IP6_NF_IPTABLES=m, we get a link
error when referencing the NF_DUP_IPV6 module:

net/netfilter/xt_TEE.o: In function `tee_tg6':
xt_TEE.c:(.text+0x14): undefined reference to `nf_dup_ipv6'

The problem here is the 'select NF_DUP_IPV6 if IP6_NF_IPTABLES'
that forces NF_DUP_IPV6 to be =m as well rather than setting it
to =y as was intended here. Adding a soft dependency on
IP6_NF_IPTABLES avoids that broken configuration.

Fixes: 5d400a4933e8 ("netfilter: Kconfig: Change select IPv6 dependencies")
Cc: Máté Eckl <ecklm94@...il.com>
Cc: Taehee Yoo <ap420073@...il.com>
Link: https://patchwork.ozlabs.org/patch/999498/
Link: https://lore.kernel.org/patchwork/patch/960062/
Reported-by: Randy Dunlap <rdunlap@...radead.org>
Reported-by: Stephen Rothwell <sfr@...b.auug.org.au>
Signed-off-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
Signed-off-by: Sasha Levin (Microsoft) <sashal@...nel.org>
---
 net/netfilter/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index f61c306de1d0..e0fb56d67d42 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -1003,6 +1003,7 @@ config NETFILTER_XT_TARGET_TEE
 	depends on NETFILTER_ADVANCED
 	depends on IPV6 || IPV6=n
 	depends on !NF_CONNTRACK || NF_CONNTRACK
+	depends on IP6_NF_IPTABLES || !IP6_NF_IPTABLES
 	select NF_DUP_IPV4
 	select NF_DUP_IPV6 if IP6_NF_IPTABLES
 	---help---
-- 
2.19.1