linux-kernel - Re: [PATCH] usb: gadget: f_hid: fix endianness issue with descriptors

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Date:   Thu, 17 Jun 2021 18:52:54 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Ruslan Bilovol <ruslan.bilovol@...il.com>
Cc:     Felipe Balbi <balbi@...nel.org>,
        Fabien Chouteau <fabien.chouteau@...co.com>,
        Segiy Stetsyuk <serg_stetsuk@....net>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...nel.org
Subject: Re: [PATCH] usb: gadget: f_hid: fix endianness issue with descriptors

On Thu, Jun 17, 2021 at 07:27:55PM +0300, Ruslan Bilovol wrote:
> Running sparse checker it shows warning message about
> incorrect endianness used for descriptor initialization:
> 
> | f_hid.c:91:43: warning: incorrect type in initializer (different base types)
> | f_hid.c:91:43:    expected restricted __le16 [usertype] bcdHID
> | f_hid.c:91:43:    got int
> 
> Fixing issue with cpu_to_le16() macro
> 
> Fixes: 71adf1189469 ("USB: gadget: add HID gadget driver")
> Cc: Fabien Chouteau <fabien.chouteau@...co.com>
> Cc: Segiy Stetsyuk <serg_stetsuk@....net>
> Cc: stable@...nel.org
> Signed-off-by: Ruslan Bilovol <ruslan.bilovol@...il.com>
> ---
>  drivers/usb/gadget/function/f_hid.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/gadget/function/f_hid.c b/drivers/usb/gadget/function/f_hid.c
> index 70774d8cb14e..02683ac0719d 100644
> --- a/drivers/usb/gadget/function/f_hid.c
> +++ b/drivers/usb/gadget/function/f_hid.c
> @@ -88,7 +88,7 @@ static struct usb_interface_descriptor hidg_interface_desc = {
>  static struct hid_descriptor hidg_desc = {
>  	.bLength			= sizeof hidg_desc,
>  	.bDescriptorType		= HID_DT_HID,
> -	.bcdHID				= 0x0101,
> +	.bcdHID				= cpu_to_le16(0x0101),

This is a BCD value, not a little-endian value, are you sure this
conversion is correct?

thanks,

greg k-h