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

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Message-ID: <20211206165050.GA48639@embeddedor>
Date:   Mon, 6 Dec 2021 10:50:50 -0600
From:   "Gustavo A. R. Silva" <gustavoars@...nel.org>
To:     José Expósito <jose.exposito89@...il.com>
Cc:     tchornyi@...vell.com, davem@...emloft.net, kuba@...nel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org,
        kernel-hardening@...ts.openwall.com
Subject: Re: [PATCH] net: prestera: replace zero-length array with
 flexible-array member

On Sat, Dec 04, 2021 at 06:13:49PM +0100, José Expósito wrote:
> 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: José Expósito <jose.exposito89@...il.com>

Reviewed-by: Gustavo A. R. Silva <gustavoars@...nel.org>

Thanks
--
Gustavo

> ---
>  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
>