[ Upstream commit ffcfb8db ]

And also do a better job of returning proper NET_{RX,XMIT}_ values.

Based on a patch by Mark Smith.

This fixes CVE-2009-2903
Reported-by: Mark Smith <lk-netdev@lk-netdev.nosense.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>