linux-kernel - Re: [PATCH v2] net/mlx5e: avoid stack overflow in mlx5e_open

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Date:	Tue, 26 Apr 2016 21:52:58 +0300
From:	Saeed Mahameed <saeedm@....mellanox.co.il>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Saeed Mahameed <saeedm@...lanox.com>,
	Matan Barak <matanb@...lanox.com>,
	Leon Romanovsky <leonro@...lanox.com>,
	"David S. Miller" <davem@...emloft.net>,
	Achiad Shochat <achiad@...lanox.com>,
	Or Gerlitz <ogerlitz@...lanox.com>, Amir Vadai <amir@...ai.me>,
	Tariq Toukan <tariqt@...lanox.com>,
	Linux Netdev List <netdev@...r.kernel.org>,
	linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] net/mlx5e: avoid stack overflow in mlx5e_open_channels

On Tue, Apr 26, 2016 at 6:52 PM, Arnd Bergmann <arnd@...db.de> wrote:
> struct mlx5e_channel_param is a large structure that is allocated
> on the stack of mlx5e_open_channels, and with a recent change
> it has grown beyond the warning size for the maximum stack
> that a single function should use:
>
> mellanox/mlx5/core/en_main.c: In function 'mlx5e_open_channels':
> mellanox/mlx5/core/en_main.c:1325:1: error: the frame size of 1072 bytes is larger than 1024 bytes [-Werror=frame-larger-than=]
>
> The function is already using dynamic allocation and is not in
> a fast path, so the easiest workaround is to use another kzalloc
> for allocating the channel parameters.
>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> Fixes: d3c9bc2743dc ("net/mlx5e: Added ICO SQs")

Acked-by: Saeed Mahameed <saeedm@...lanox.com>