Re: [PATCH] usb: gadget: f_hid: drop ERROR() on copy_from_user() failure

[David Laight <david.laight.linux@gmail.com>]

On Tue, 18 Aug 2026 09:21:18 +0800
Linkai Gong <gonglinkai@kylinos.cn> wrote:

> A failed copy_from_user() is a userspace error and should not spam the
> kernel log. Just free the temporary entry and return.
> 
> Suggested-by: David Laight <david.laight.linux@gmail.com>
> Signed-off-by: Linkai Gong <gonglinkai@kylinos.cn>
> ---
>  drivers/usb/gadget/function/f_hid.c | 1 -
>  1 file changed, 1 deletion(-)
> diff --git a/drivers/usb/gadget/function/f_hid.c b/drivers/usb/gadget/function/f_hid.c
> index 3c6b43d06a6d..5c39da1ac7a6 100644
> --- a/drivers/usb/gadget/function/f_hid.c
> +++ b/drivers/usb/gadget/function/f_hid.c
> @@ -656,7 +656,6 @@ static int f_hidg_get_report(struct file *file, struct usb_hidg_report __user *b
>  
>  	if (copy_from_user(&entry->report_data, buffer,
>  				sizeof(struct usb_hidg_report))) {
> -		ERROR(cdev, "copy_from_user error\n");
>  		kfree(entry);
>  		return -EINVAL;

This should be -EFAULT.

David

>  	}