Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
From:   Jaehee Park <jhpark1013@gmail.com>
To:     netdev@vger.kernel.org
Cc:     davem@davemloft.net, yoshfuji@linux-ipv6.org, dsahern@kernel.org,
        dsahern@gmail.com, edumazet@google.com, kuba@kernel.org,
        pabeni@redhat.com, shuah@kernel.org, linux-kernel@vger.kernel.org,
        aajith@arista.com, roopa@nvidia.com, roopa.prabhu@gmail.com,
        aroulin@nvidia.com, sbrivio@redhat.com, jhpark1013@gmail.com,
        nicolas.dichtel@6wind.com
Subject: [PATCH net-next] net: ipv6: avoid accepting values greater than 2 for accept_untracked_na
Date:   Wed, 20 Jul 2022 02:52:11 -0400
Message-Id: <20220720065211.369241-1-jhpark1013@gmail.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

The accept_untracked_na sysctl changed from a boolean to an integer
when a new knob '2' was added. This patch provides a safeguard to avoid
accepting values that are not defined in the sysctl. When setting a
value greater than 2, the user will get an 'invalid argument' warning.

Signed-off-by: Jaehee Park <jhpark1013@gmail.com>
Suggested-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Suggested-by: Roopa Prabhu <roopa@nvidia.com>
---
 net/ipv6/addrconf.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 6ed807b6c647..d3e77ea24f05 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -7042,9 +7042,9 @@ static const struct ctl_table addrconf_sysctl[] = {
 		.data		= &ipv6_devconf.accept_untracked_na,
 		.maxlen		= sizeof(int),
 		.mode		= 0644,
-		.proc_handler	= proc_dointvec,
+		.proc_handler	= proc_dointvec_minmax,
 		.extra1		= (void *)SYSCTL_ZERO,
-		.extra2		= (void *)SYSCTL_ONE,
+		.extra2		= (void *)SYSCTL_TWO,
 	},
 	{
 		/* sentinel */
-- 
2.30.2