Instant MFC:
Instant MFC:

Fix integer overflow in IGMP protocol.

Security:	FreeBSD-SA-15:04.igmp
Security:	CVE-2015-1414
Found by:	Mateusz Kocielski, Logicaltrust
Analyzed by:	Marek Kroemeke, Mateusz Kocielski (shm@NetBSD.org) and
		22733db72ab3ed94b5f8a1ffcde850251fe6f466
Submited by:	Mariusz Zaborski <oshogbo@FreeBSD.org>
Reviewed by:	bms
Approved by:	so

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