linux-kernel - Re: [PATCH v2 3/5] staging: r8188eu: incorrect type in csum_ipv6

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Date:   Fri, 20 Aug 2021 16:48:34 -0500
From:   Larry Finger <Larry.Finger@...inger.net>
To:     Aakash Hemadri <aakashhemadri123@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Phillip Potter <phil@...lpotter.co.uk>
Cc:     linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/5] staging: r8188eu: incorrect type in
 csum_ipv6_magic

On 8/19/21 3:17 AM, 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 ntohs()
> 
> 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 6a0462ce6230..d4acf02ca64f 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,
> +										ntohs(iph->payload_len),
>   										IPPROTO_ICMPV6,
> -										csum_partial((__u8 *)hdr, iph->payload_len, 0));
> +										csum_partial((__u8 *)hdr, ntohs(iph->payload_len), 0));
>   					}
>   				}
>   			}
> 

This patch is correct. Again, I like be16_to_cpu() better than ntohs(), but that 
is not a deal breaker. The kernel is split on the usage.

Larry