linux-kernel - Re: [PATCH][next] xen/pci: Avoid -Wflex-array-member-not-at-end warning

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Message-ID: <202408221040.2961A81@keescook>
Date: Thu, 22 Aug 2024 10:41:50 -0700
From: Kees Cook <kees@...nel.org>
To: "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: Juergen Gross <jgross@...e.com>,
	Stefano Stabellini <sstabellini@...nel.org>,
	Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>,
	xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: Re: [PATCH][next] xen/pci: Avoid -Wflex-array-member-not-at-end
 warning

On Tue, Aug 20, 2024 at 06:50:56PM -0600, Gustavo A. R. Silva wrote:
> Use the `DEFINE_RAW_FLEX()` helper for an on-stack definition of
> a flexible structure where the size of the flexible-array member
> is known at compile-time, and refactor the rest of the code,
> accordingly.
> 
> So, with this, fix the following warning:
> 
> drivers/xen/pci.c:48:55: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
> 
> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
> ---
>  drivers/xen/pci.c | 14 +++++---------
>  1 file changed, 5 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/xen/pci.c b/drivers/xen/pci.c
> index 72d4e3f193af..a2facd8f7e51 100644
> --- a/drivers/xen/pci.c
> +++ b/drivers/xen/pci.c
> @@ -44,15 +44,11 @@ static int xen_add_device(struct device *dev)
>  	}
>  #endif
>  	if (pci_seg_supported) {
> -		struct {
> -			struct physdev_pci_device_add add;
> -			uint32_t pxm;
> -		} add_ext = {
> -			.add.seg = pci_domain_nr(pci_dev->bus),
> -			.add.bus = pci_dev->bus->number,
> -			.add.devfn = pci_dev->devfn
> -		};
> -		struct physdev_pci_device_add *add = &add_ext.add;
> +		DEFINE_RAW_FLEX(struct physdev_pci_device_add, add, optarr, 1);
> +
> +		add->seg = pci_domain_nr(pci_dev->bus);
> +		add->bus = pci_dev->bus->number;
> +		add->devfn = pci_dev->devfn;
>  
>  #ifdef CONFIG_ACPI
>  		acpi_handle handle;

Looks correct to me!

Reviewed-by: Kees Cook <kees@...nel.org>

-- 
Kees Cook