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Message-ID: <Y72SkdnBkwxQYXoT@nanopsycho> Date: Tue, 10 Jan 2023 17:30:09 +0100 From: Jiri Pirko <jiri@...nulli.us> 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 Thu, Jan 05, 2023 at 11:36:43PM CET, keescook@...omium.org 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> Reviewed-by: Jiri Pirko <jiri@...dia.com>
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