linux-kernel - Re: [PATCH v5 2/3] staging: r8188eu: incorrect type in csum_ipv6

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Date:   Thu, 2 Sep 2021 11:27:15 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Aakash Hemadri <aakashhemadri123@...il.com>
Cc:     Larry Finger <Larry.Finger@...inger.net>,
        Phillip Potter <phil@...lpotter.co.uk>,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 2/3] staging: r8188eu: incorrect type in
 csum_ipv6_magic

On Sat, Aug 28, 2021 at 04:40:45PM +0530, Aakash Hemadri wrote:
> Fix sparse warning:
> > rtw_br_ext.c:771:84:    got restricted __be16 [usertype] payload_len
> > rtw_br_ext.c:773:110: warning: incorrect type in argument 2
>     (different base types)
> > rtw_br_ext.c:773:110:    expected int len
> > rtw_br_ext.c:773:110:    got restricted __be16 [usertype] payload_len
> 
> csum_ipv6_magic and csum_partial expect int len not __be16, use
> be16_to_cpu()
> 
> Signed-off-by: Aakash Hemadri <aakashhemadri123@...il.com>
> ---
>  drivers/staging/r8188eu/core/rtw_br_ext.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/staging/r8188eu/core/rtw_br_ext.c b/drivers/staging/r8188eu/core/rtw_br_ext.c
> index aa56cd1a8490..38f1bd591da9 100644
> --- a/drivers/staging/r8188eu/core/rtw_br_ext.c
> +++ b/drivers/staging/r8188eu/core/rtw_br_ext.c
> @@ -615,9 +615,9 @@ int nat25_db_handle(struct adapter *priv, struct sk_buff *skb, int method)
>  						struct icmp6hdr  *hdr = (struct icmp6hdr *)(skb->data + ETH_HLEN + sizeof(*iph));
>  						hdr->icmp6_cksum = 0;
>  						hdr->icmp6_cksum = csum_ipv6_magic(&iph->saddr, &iph->daddr,
> -										iph->payload_len,
> +										be16_to_cpu(iph->payload_len),
>  										IPPROTO_ICMPV6,
> -										csum_partial((__u8 *)hdr, iph->payload_len, 0));
> +										csum_partial((__u8 *)hdr, be16_to_cpu(iph->payload_len), 0));
>  					}
>  				}
>  			}
> -- 
> 2.32.0
> 

Same question here, does this mean the driver is broken on little-endian
systems today?  This should be tested...

thanks,

greg k-h