[CVE-2010-3877] net: tipc: fix information leak to userland

[Andy Whitcroft]

CVE-2010-3877:

	Structure sockaddr_tipc is copied to userland with padding bytes
	after "id" field in union field "name" unitialized. It leads to
	leaking of contents of kernel stack memory. We have to initialize
	them to zero.

This fix is already upstream in the commit below:

  commit 88f8a5e3e7defccd3925cabb1ee4d3994e5cdb52
  Author: Kulikov Vasiliy <segooon at gmail.com>
  Date: Sun Oct 31 07:10:32 2010 +0000

    net: tipc: fix information leak to userland

    Structure sockaddr_tipc is copied to userland with padding bytes after
    "id" field in union field "name" unitialized. It leads to leaking of
    contents of kernel stack memory. We have to initialize them to zero.

    Signed-off-by: Vasiliy Kulikov <segooon at gmail.com>
    Signed-off-by: David S. Miller <davem at davemloft.net>

This commit cherry-picks cleanly back to Maverick, Lucid, and Karmic;
I have backported the same fix to Hardy; Dapper is unaffected as it does
not have the said protocol.

Following this email are two patches, one applies cleanly to Maverick,
Lucid, and Karmic.  The other is for Hardy.

-apw