linux-kernel - Re: [PATCH][next] net/mlx5: fix unintentional sign extension on shift of dest_attr->vport.vhca

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Message-ID: <20250117105813.GL6206@kernel.org>
Date: Fri, 17 Jan 2025 10:58:13 +0000
From: Simon Horman <horms@...nel.org>
To: Colin Ian King <colin.i.king@...il.com>
Cc: Saeed Mahameed <saeedm@...dia.com>, Leon Romanovsky <leon@...nel.org>,
	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>,
	Moshe Shemesh <moshe@...dia.com>,
	Yevgeny Kliteynik <kliteyn@...dia.com>,
	Mark Bloch <mbloch@...dia.com>, netdev@...r.kernel.org,
	linux-rdma@...r.kernel.org, kernel-janitors@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] net/mlx5: fix unintentional sign extension on
 shift of dest_attr->vport.vhca_id

On Thu, Jan 16, 2025 at 06:17:00PM +0000, Colin Ian King wrote:
> Shifting dest_attr->vport.vhca_id << 16 results in a promotion from an
> unsigned 16 bit integer to a 32 bit signed integer, this is then sign
> extended to a 64 bit unsigned long on 64 bitarchitectures. If vhca_id is
> greater than 0x7fff then this leads to a sign extended result where all
> the upper 32 bits of idx are set to 1. Fix this by casting vhca_id
> to the same type as idx before performing the shift.
> 
> Fixes: 8e2e08a6d1e0 ("net/mlx5: fs, add support for dest vport HWS action")
> Signed-off-by: Colin Ian King <colin.i.king@...il.com>

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