OPNSense/src f8c42b0sys/netinet ip_icmp.c

Fix ICMP buffer underwrite. [EN-18:13.icmp]

Approved by:    so
Security:       FreeBSD-EN-18:13.icmp
Security:       CVE-2018-17156
DeltaFile
+6-2sys/netinet/ip_icmp.c
+6-21 files

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