linux-kernel - Re: [PATCH] staging: wlan-ng: Fixed incorrect type warning in p80211netdev.c

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Date:   Thu, 18 Feb 2021 15:04:55 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Pritthijit Nath <pritthijit.nath@...oud.com>
Cc:     gregkh@...uxfoundation.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: wlan-ng: Fixed incorrect type warning in
 p80211netdev.c

On Wed, Feb 17, 2021 at 09:12:55PM +0530, Pritthijit Nath wrote:
> This change fixes a sparse warning "incorrect type in argument 1
> (different address spaces)".
> 
> Signed-off-by: Pritthijit Nath <pritthijit.nath@...oud.com>
> ---
>  drivers/staging/wlan-ng/p80211netdev.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/wlan-ng/p80211netdev.c b/drivers/staging/wlan-ng/p80211netdev.c
> index 6f9666dc0277..70570e8a5ad2 100644
> --- a/drivers/staging/wlan-ng/p80211netdev.c
> +++ b/drivers/staging/wlan-ng/p80211netdev.c
> @@ -569,7 +569,7 @@ static int p80211knetdev_do_ioctl(struct net_device *dev,
>  		goto bail;
>  	}
>  
> -	msgbuf = memdup_user(req->data, req->len);
> +	msgbuf = memdup_user((void __user *)req->data, req->len);

Probably the correct fix is to just change the type of
(struct p80211ioctl_req)->data from caddr_t to "void __user *data;".

I haven't looked at this though, so double check.

regards,
dan carpenter