netdev - Re: [PATCH] net-tcp: /proc/sys/net/ipv4/tcp_probe

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Message-ID: <95f0f122-9964-28c5-2c7c-72309c095e62@gmail.com>
Date:   Tue, 25 Sep 2018 19:53:53 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Maciej Żenczykowski <zenczykowski@...il.com>,
        Maciej Żenczykowski <maze@...gle.com>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH] net-tcp: /proc/sys/net/ipv4/tcp_probe_interval is a u32
 not int



On 09/25/2018 05:41 PM, Maciej Żenczykowski wrote:
> From: Maciej Żenczykowski <maze@...gle.com>
> 
> (fix documentation and sysctl access to treat it as such)
> 
> Signed-off-by: Maciej Żenczykowski <maze@...gle.com>
> ---

While we are at it, we probably should add sane limits,
given tcp_mtu_check_reprobe() does :

u32 interval = net->ipv4.sysctl_tcp_probe_interval;
...
if (unlikely(delta >= interval * HZ)) {

A limit of UINT_MAX / HZ would avoid an overflow I guess.