UBUNTU: SAUCE: (noup) netfilter: x_tables: check for size overflow

BugLink: http://bugs.launchpad.net/bugs/1555353

http://marc.info/?l=netfilter-devel&m=145757136822750&w=2



Ben Hawkes says:
 integer overflow in xt_alloc_table_info, which on 32-bit systems can
 lead to small structure allocation and a copy_from_user based heap
 corruption.

Reported-by: Ben Hawkes <hawkes@google.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>