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

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Date:	Thu, 28 Apr 2016 16:47:40 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	arnd@...db.de
Cc:	saeedm@...lanox.com, matanb@...lanox.com, leonro@...lanox.com,
	achiad@...lanox.com, ogerlitz@...lanox.com, amir@...ai.me,
	tariqt@...lanox.com, 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

From: Arnd Bergmann <arnd@...db.de>
Date: Tue, 26 Apr 2016 17:52:33 +0200

> 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")
> ---
> v2: move allocation back into caller, as suggested by Saeed Mahameed

Applied, thanks Arnd.