netdev - Re: [PATCH] net: prestera: replace zero-length array with flexible-array member

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Message-ID: <VI1P190MB07344B3C160E9A73165422A28F6B9@VI1P190MB0734.EURP190.PROD.OUTLOOK.COM>
Date:   Sat, 4 Dec 2021 17:38:21 +0000
From:   Volodymyr Mytnyk <volodymyr.mytnyk@...ision.eu>
To:     José Expósito <jose.exposito89@...il.com>,
        "tchornyi@...vell.com" <tchornyi@...vell.com>
CC:     "davem@...emloft.net" <davem@...emloft.net>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-hardening@...r.kernel.org" <linux-hardening@...r.kernel.org>,
        "kernel-hardening@...ts.openwall.com" 
        <kernel-hardening@...ts.openwall.com>,
        "gustavoars@...nel.org" <gustavoars@...nel.org>
Subject: Re: [PATCH] net: prestera: replace zero-length array with
 flexible-array member

> Subject: [PATCH] net: prestera: replace zero-length array with flexible-array member 
>  
> One-element and zero-length arrays are deprecated and should be
> replaced with flexible-array members:
> https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays
> 
> Replace zero-length array with flexible-array member and make use
> of the struct_size() helper.
> 
> Link: https://github.com/KSPP/linux/issues/78
> Signed-off-by: Jose Exposito <jose.exposito89@...il.com>
> ---
>  drivers/net/ethernet/marvell/prestera/prestera_hw.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/marvell/prestera/prestera_hw.c b/drivers/net/ethernet/marvell/prestera/prestera_hw.c
> index 92cb5e9099c6..6282c9822e2b 100644
> --- a/drivers/net/ethernet/marvell/prestera/prestera_hw.c
> +++ b/drivers/net/ethernet/marvell/prestera/prestera_hw.c
> @@ -443,7 +443,7 @@ struct prestera_msg_counter_resp {
>          __le32 offset;
>          __le32 num_counters;
>          __le32 done;
> -       struct prestera_msg_counter_stats stats[0];
> +       struct prestera_msg_counter_stats stats[];
>  };
>  
>  struct prestera_msg_span_req {
> @@ -1900,7 +1900,7 @@ int prestera_hw_counters_get(struct prestera_switch *sw, u32 idx,
>                  .block_id = __cpu_to_le32(idx),
>                  .num_counters = __cpu_to_le32(*len),
>          };
> -       size_t size = sizeof(*resp) + sizeof(*resp->stats) * (*len);
> +       size_t size = struct_size(resp, stats, *len);
>          int err, i;
>  
>          resp = kmalloc(size, GFP_KERNEL);
> -- 
> 2.25.1

Thanks.

Reviewed-by: Volodymyr Mytnyk <vmytnyk@...vell.com>
Tested-by: Volodymyr Mytnyk <vmytnyk@...vell.com>