linux-kernel - Re: [PATCH 2/2] netlink: Diag core and basic socket info dumping

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Date:	Thu, 21 Mar 2013 12:52:30 +0000
From:	Thomas Graf <tgraf@...g.ch>
To:	Andrey Vagin <avagin@...nvz.org>
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Pavel Emelyanov <xemul@...allels.com>,
	Pablo Neira Ayuso <pablo@...filter.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Gao feng <gaofeng@...fujitsu.com>
Subject: Re: [PATCH 2/2] netlink: Diag core and basic socket info dumping

On 03/21/13 at 01:21pm, Andrey Vagin wrote:
> diff --git a/include/uapi/linux/netlink_diag.h b/include/uapi/linux/netlink_diag.h
> new file mode 100644
> index 0000000..9328866
> --- /dev/null
> +++ b/include/uapi/linux/netlink_diag.h
> +enum {
> +	NETLINK_DIAG_MEMINFO,
> +	NETLINK_DIAG_GROUPS,
> +
> +	NETLINK_DIAG_MAX,
> +};

Please follow the common pattern and define NETLINK_DIAG_MAX as
NETLINK_DIAG_GROUPS like other by doing>

	[...] 
        __NETLINK_DIAG_MAX,
};
 
#define NETLINK_DIAG_MAX (__NETLINK_DIAG_MAX - 1)
 
Everyone is used to do:
 
        struct nlattr *attrs[NETLINK_DIAG_MAX+1];
         
        nla_parse([...], NETLINK_DIAG_MAX, [...]

In fact, the follow-up patch to ss is buggy because of this.
UNIX_DIAG_MAX suffers from the same problem which is problem the
cause for this.
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