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

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Message-ID: <5d597234-f858-4527-b6fd-111356af3705@huawei.com>
Date: Wed, 3 Sep 2025 19:21:01 +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>
Subject: Re: [PATCH net-next] ipv6: Add sanity checks on
 ipv6_devconf.seg6_enabled

Sorry, pls ignore this error patch.

On 2025/9/3 17:39, Yue Haibing wrote:
> 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>
> ---
>  net/ipv6/addrconf.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
> index 40e9c336f6c5..87f14532cb7e 100644
> --- a/net/ipv6/addrconf.c
> +++ b/net/ipv6/addrconf.c
> @@ -7193,6 +7193,8 @@ static const struct ctl_table addrconf_sysctl[] = {
>  		.maxlen		= sizeof(int),
>  		.mode		= 0644,
>  		.proc_handler	= proc_dointvec,
> +		.extra1		= SYSCTL_ZERO,
> +		.extra2		= SYSCTL_ONE,
>  	},
>  #ifdef CONFIG_IPV6_SEG6_HMAC
>  	{