linux-kernel - Re: [PATCH v3] ethtool: avoiding integer overflow in ethtool_phys

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Date:   Wed, 23 Nov 2022 20:11:36 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Maxim Korotkov <korotkov.maxim.s@...il.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Guangbin Huang <huangguangbin2@...wei.com>,
        Andrew Lunn <andrew@...n.ch>,
        Alexander Lobakin <alexandr.lobakin@...el.com>,
        "Keller, Jacob E" <jacob.e.keller@...el.com>,
        Tom Rix <trix@...hat.com>, Marco Bonelli <marco@...eim.net>,
        Edward Cree <ecree@...arflare.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, lvc-project@...uxtesting.org
Subject: Re: [PATCH v3] ethtool: avoiding integer overflow in
 ethtool_phys_id()

On Tue, 22 Nov 2022 15:29:01 +0300 Maxim Korotkov wrote:
> The value of an arithmetic expression "n * id.data" is subject
> to possible overflow due to a failure to cast operands to a larger data
> type before performing arithmetic. Used macro for multiplication instead
> operator for avoiding overflow.
> 
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
> 
> Signed-off-by: Maxim Korotkov <korotkov.maxim.s@...il.com>

Applying to net-next, pretty sure nobody expects us to support blinking
an LED 4 billion times, at a rate low enough for a human eye to see...
But let's watch the stable bots pick it up anyway.