linux-hardening - Re: [PATCH][next] nfp: Avoid -Wflex-array-member-not-at-end warnings

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Message-ID: <20240401212424.34a9a9cd@kernel.org>
Date: Mon, 1 Apr 2024 21:24:24 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: Louis Peens <louis.peens@...igine.com>, "David S. Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Paolo Abeni
 <pabeni@...hat.com>, oss-drivers@...igine.com, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH][next] nfp: Avoid -Wflex-array-member-not-at-end
 warnings

On Thu, 28 Mar 2024 19:17:10 -0600 Gustavo A. R. Silva wrote:
> --- a/drivers/net/ethernet/netronome/nfp/nfp_net_debugdump.c
> +++ b/drivers/net/ethernet/netronome/nfp/nfp_net_debugdump.c
> @@ -34,8 +34,11 @@ enum nfp_dumpspec_type {
>  
>  /* generic type plus length */
>  struct nfp_dump_tl {
> -	__be32 type;
> -	__be32 length;	/* chunk length to follow, aligned to 8 bytes */
> +	/* New members must be added within the struct_group() macro below. */
> +	struct_group_tagged(nfp_dump_tl_hdr, hdr,
> +		__be32 type;
> +		__be32 length;	/* chunk length to follow, aligned to 8 bytes */
> +	);
>  	char data[];
>  };

I counted 9 references to nfp_dump_tl->data.
Better to add:

static void *nfp_dump_tl_data(struct nfp_dump_tl *spec)
{
	return &spec[1];
}

and delete the flex array completely.
-- 
pw-bot: cr