[CVE artful/linux trusty/linux CVE-2018-5803] SCTP DOS

[Andy Whitcroft]

CVE-2018-5803:
	It was discovered that the SCTP Protocol implementation in
	the Linux kernel did not properly validate userspace provided
	payload lengths in some situations. A local attacker could
	use this to cause a denial of service (system crash).

Following this email are patches for artful/linux (a cherry-pick) and
trusty/linux (a backport).  Other series have received this fix via
upstream and stables.

Proposing for SRU to artful/linux and trusty/linux.

-apw