linux-kernel - [PATCH v2 net-next] ipv6: Add sanity checks on ipv6_devconf.seg6

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Message-ID: <20250903115648.3126719-1-yuehaibing@huawei.com>
Date: Wed, 3 Sep 2025 19:56:48 +0800
From: Yue Haibing <yuehaibing@...wei.com>
To: <davem@...emloft.net>, <dsahern@...nel.org>, <edumazet@...gle.com>,
	<kuba@...nel.org>, <pabeni@...hat.com>, <horms@...nel.org>
CC: <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<yuehaibing@...wei.com>
Subject: [PATCH v2 net-next] ipv6: Add sanity checks on ipv6_devconf.seg6_enabled

In ipv6_srh_rcv() we use min(net->ipv6.devconf_all->seg6_enabled,
idev->cnf.seg6_enabled) is intended to return 0 when either value is zero,
but if one of the values is negative it will in fact return non-zero.

Signed-off-by: Yue Haibing <yuehaibing@...wei.com>
---
v2: use proc_dointvec_minmax()
---
 net/ipv6/addrconf.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 40e9c336f6c5..69ec9cb6031e 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -7192,7 +7192,9 @@ static const struct ctl_table addrconf_sysctl[] = {
 		.data		= &ipv6_devconf.seg6_enabled,
 		.maxlen		= sizeof(int),
 		.mode		= 0644,
-		.proc_handler	= proc_dointvec,
+		.proc_handler	= proc_dointvec_minmax,
+		.extra1		= SYSCTL_ZERO,
+		.extra2		= SYSCTL_ONE,
 	},
 #ifdef CONFIG_IPV6_SEG6_HMAC
 	{
-- 
2.34.1