linux-kernel - Re: [PATCH] drivers:atlx: Prevent integer overflow in statistics aggregation

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Message-ID: <20241007172715.649822ba@kernel.org>
Date: Mon, 7 Oct 2024 17:27:15 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Rand Deeb <rand.sec96@...il.com>
Cc: Chris Snook <chris.snook@...il.com>, "David S . Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Paolo Abeni
 <pabeni@...hat.com>, Christian Marangi <ansuelsmth@...il.com>,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
 deeb.rand@...fident.ru, lvc-project@...uxtesting.org,
 voskresenski.stanislav@...fident.ru
Subject: Re: [PATCH] drivers:atlx: Prevent integer overflow in statistics
 aggregation

On Mon,  7 Oct 2024 12:29:36 +0300 Rand Deeb wrote:
> The `atl1_inc_smb` function aggregates various RX and TX error counters
> from the `stats_msg_block` structure. Currently, the arithmetic operations
> are performed using `u32` types, which can lead to integer overflow when
> summing large values. This overflow occurs before the result is cast to
> a `u64`, potentially resulting in inaccurate network statistics.
> 
> To mitigate this risk, each operand in the summation is explicitly cast to
> `u64` before performing the addition. This ensures that the arithmetic is
> executed in 64-bit space, preventing overflow and maintaining accurate
> statistics regardless of the system architecture.

Thanks for the nice commit message, but honestly I don't think
the error counters can overflow u32 on an ancient NIC like this.
-- 
pw-bot: reject