linux-kernel - Re: [PATCH][next] net: dsa: ksz: Make reg_mib

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Message-ID: <61ccfbdd-c1d5-a91a-d651-90e6cae1a48e@gmail.com>
Date:   Wed, 28 Apr 2021 08:50:54 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Colin King <colin.king@...onical.com>,
        Woojung Huh <woojung.huh@...rochip.com>,
        UNGLinuxDriver@...rochip.com, Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, Marek Vasut <marex@...x.de>,
        Tristram Ha <Tristram.Ha@...rochip.com>, netdev@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] net: dsa: ksz: Make reg_mib_cnt a u8 as it never
 exceeds 255



On 4/28/2021 5:00 AM, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> Currently the for-loop in ksz8_port_init_cnt is causing a static
> analysis infinite loop warning with the comparison of
> mib->cnt_ptr < dev->reg_mib_cnt. This occurs because mib->cnt_ptr
> is a u8 and dev->reg_mib_cnt is an int and the analyzer determines
> that mib->cnt_ptr potentially can wrap around to zero if the value
> in dev->reg_mib_cnt is > 255. However, this value is never this
> large, it is always less than 256 so make reg_mib_cnt a u8.

Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
-- 
Florian