linux-hardening - Re: [PATCH] net/mlx5e: Replace 0-length array with flexible array

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Message-ID: <Y73ffWiXFar9xNQM@x130>
Date:   Tue, 10 Jan 2023 13:58:21 -0800
From:   Saeed Mahameed <saeed@...nel.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     Saeed Mahameed <saeedm@...dia.com>,
        Leon Romanovsky <leon@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        netdev@...r.kernel.org, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] net/mlx5e: Replace 0-length array with flexible array

On 05 Jan 14:36, Kees Cook wrote:
>Zero-length arrays are deprecated[1]. Replace struct mlx5e_rx_wqe_cyc's
>"data" 0-length array with a flexible array. Detected with GCC 13,
>using -fstrict-flex-arrays=3:
>
>drivers/net/ethernet/mellanox/mlx5/core/en_main.c: In function 'mlx5e_alloc_rq':
>drivers/net/ethernet/mellanox/mlx5/core/en_main.c:827:42: warning: array subscript f is outside array bounds of 'struct mlx5_wqe_data_seg[0]' [-Warray-bounds=]
>  827 |                                 wqe->data[f].byte_count = 0;
>      |                                 ~~~~~~~~~^~~
>In file included from drivers/net/ethernet/mellanox/mlx5/core/en/tc_ct.h:11,
>                 from drivers/net/ethernet/mellanox/mlx5/core/eswitch.h:48,
>                 from drivers/net/ethernet/mellanox/mlx5/core/en_main.c:42:
>drivers/net/ethernet/mellanox/mlx5/core/en.h:250:39: note: while referencing 'data'
>  250 |         struct mlx5_wqe_data_seg      data[0];
>      |                                       ^~~~
>
>[1] https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays
>
>Cc: Saeed Mahameed <saeedm@...dia.com>
>Cc: Leon Romanovsky <leon@...nel.org>
>Cc: "David S. Miller" <davem@...emloft.net>
>Cc: Eric Dumazet <edumazet@...gle.com>
>Cc: Jakub Kicinski <kuba@...nel.org>
>Cc: Paolo Abeni <pabeni@...hat.com>
>Cc: "Gustavo A. R. Silva" <gustavoars@...nel.org>
>Cc: netdev@...r.kernel.org
>Cc: linux-rdma@...r.kernel.org
>Signed-off-by: Kees Cook <keescook@...omium.org>

Applied to net-next-mlx5, Thanks!