linux-kernel - Re: [PATCH v2 net] net/mlx4_en: Prevent potential integer overflow calculating Hz

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Message-ID: <20250528184449.GI1484967@horms.kernel.org>
Date: Wed, 28 May 2025 19:44:49 +0100
From: Simon Horman <horms@...nel.org>
To: Dan Carpenter <dan.carpenter@...aro.org>
Cc: Eugenia Emantayev <eugenia@...lanox.com>,
	Tariq Toukan <tariqt@...dia.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Matan Barak <matanb@...lanox.com>, netdev@...r.kernel.org,
	linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [PATCH v2 net] net/mlx4_en: Prevent potential integer overflow
 calculating Hz

On Wed, May 28, 2025 at 11:11:09AM +0300, Dan Carpenter wrote:
> The "freq" variable is in terms of MHz and "max_val_cycles" is in terms
> of Hz.  The fact that "max_val_cycles" is a u64 suggests that support
> for high frequency is intended but the "freq_khz * 1000" would overflow
> the u32 type if we went above 4GHz.  Use unsigned long long type for the
> mutliplication to prevent that.
> 
> Fixes: 31c128b66e5b ("net/mlx4_en: Choose time-stamping shift value according to HW frequency")
> Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>

Reviewed-by: Simon Horman <horms@...nel.org>