Re: [PATCH bpf-next] net/bpf: Avoid unused "sin_addr_len" warning when CONFIG_CGROUP_BPF is not set

[Kuniyuki Iwashima <kuniyu@amazon.com>]

From: Martin KaFai Lau <martin.lau@linux.dev>
Date: Fri, 13 Oct 2023 11:57:02 -0700
> From: Martin KaFai Lau <martin.lau@kernel.org>
> 
> It was reported that there is a compiler warning on the unused variable
> "sin_addr_len" in af_inet.c when CONFIG_CGROUP_BPF is not set.
> This patch is to address it similar to the ipv6 counterpart
> in inet6_getname(). It is to "return sin_addr_len;"
> instead of "return sizeof(*sin);".
> 
> Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
> Closes: https://lore.kernel.org/bpf/20231013114007.2fb09691@canb.auug.org.au/
> Cc: Daan De Meyer <daan.j.demeyer@gmail.com>
> Fixes: fefba7d1ae19 ("bpf: Propagate modified uaddrlen from cgroup sockaddr programs")
> Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>

Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>

Thanks!


> ---
>  net/ipv4/af_inet.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
> index 7e27ad37b939..5ce275b2d7ef 100644
> --- a/net/ipv4/af_inet.c
> +++ b/net/ipv4/af_inet.c
> @@ -814,7 +814,7 @@ int inet_getname(struct socket *sock, struct sockaddr *uaddr,
>  	}
>  	release_sock(sk);
>  	memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
> -	return sizeof(*sin);
> +	return sin_addr_len;
>  }
>  EXPORT_SYMBOL(inet_getname);
>  
> -- 
> 2.34.1