netdev - Re: [WTF?] random test in netlink

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Message-Id: <20141212.200758.944592759380344519.davem@davemloft.net>
Date:	Fri, 12 Dec 2014 20:07:58 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	viro@...IV.linux.org.uk
Cc:	kaber@...sh.net, netdev@...r.kernel.org
Subject: Re: [WTF?] random test in netlink_sendmsg()

From: Al Viro <viro@...IV.linux.org.uk>
Date: Fri, 12 Dec 2014 21:32:43 +0000

> What do we want sendmsg(fd, &msg, 0) to do when fd is AF_NETLINK socket
> that had setsockopt(fd, SOL_NETLINK, NETLINK_TX_RING, ...) successfully done
> to it and msg.msg_iovlen is 0?

We had a similar issue with msg_name/msg_namelen and we ended up saying
that if msg_namelen is zero then we force msg_name to NULL.
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