netdev - Re: [PATCH net-next] netlink: gc useless variable in nlmsg

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Thu, 12 Aug 2021 15:05:52 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Alexey Dobriyan <adobriyan@...il.com>
Cc:     davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: [PATCH net-next] netlink: gc useless variable in
 nlmsg_attrdata()

On Fri, 13 Aug 2021 00:24:01 +0300 Alexey Dobriyan wrote:
> Kernel permits pointer arithmetic on "void*" so might as well use it
> without casts back and forth.

But why change existing code? It's perfectly fine, right?

> --- a/include/net/netlink.h
> +++ b/include/net/netlink.h
> @@ -587,8 +587,7 @@ static inline int nlmsg_len(const struct nlmsghdr *nlh)
>  static inline struct nlattr *nlmsg_attrdata(const struct nlmsghdr *nlh,
>  					    int hdrlen)
>  {
> -	unsigned char *data = nlmsg_data(nlh);
> -	return (struct nlattr *) (data + NLMSG_ALIGN(hdrlen));
> +	return nlmsg_data(nlh) + NLMSG_ALIGN(hdrlen);
>  }
>  
>  /**