netdev - Re: [PATCHv2 net 1/4] bonding: fix send_peer

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Date:   Fri, 28 Apr 2023 22:04:22 +0200
From:   Simon Horman <simon.horman@...igine.com>
To:     Hangbin Liu <liuhangbin@...il.com>
Cc:     netdev@...r.kernel.org, Jay Vosburgh <j.vosburgh@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Liang Li <liali@...hat.com>, Vincent Bernat <vincent@...nat.ch>
Subject: Re: [PATCHv2 net 1/4] bonding: fix send_peer_notif overflow

On Thu, Apr 27, 2023 at 11:39:06AM +0800, Hangbin Liu wrote:

...

> diff --git a/drivers/net/bonding/bond_netlink.c b/drivers/net/bonding/bond_netlink.c
> index c2d080fc4fc4..09a501cdea0c 100644
> --- a/drivers/net/bonding/bond_netlink.c
> +++ b/drivers/net/bonding/bond_netlink.c
> @@ -244,6 +244,12 @@ static int bond_changelink(struct net_device *bond_dev, struct nlattr *tb[],
>  	if (data[IFLA_BOND_PEER_NOTIF_DELAY]) {
>  		int delay = nla_get_u32(data[IFLA_BOND_PEER_NOTIF_DELAY]);
>  
> +		if (delay > 300000) {
> +			NL_SET_ERR_MSG_ATTR(extack, data[IFLA_BOND_PEER_NOTIF_DELAY],
> +					    "peer_notif_delay should be less than 300s");
> +			return -EINVAL;
> +		}

Hi Hangbin,

can this limit be implemented using NLA_POLICY_MAX() in bond_policy ?

> +
>  		bond_opt_initval(&newval, delay);
>  		err = __bond_opt_set(bond, BOND_OPT_PEER_NOTIF_DELAY, &newval,
>  				     data[IFLA_BOND_PEER_NOTIF_DELAY], extack);

...