[Bug 229378] crash in in_gif_lookup

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=229378

--- Comment #2 from commit-hook at freebsd.org ---
A commit references this bug:

Author: ae
Date: Thu Jun 28 11:39:28 UTC 2018
New revision: 335760
URL: https://svnweb.freebsd.org/changeset/base/335760

Log:
  Add NULL pointer check.

  encap_lookup_t method can be invoked by IP encap subsytem even if none
  of gif/gre/me interfaces are exist. Hash tables are allocated on demand,
  when first interface is created. So, make NULL pointer check before
  doing access to hash table.

  PR:           229378

Changes:
  head/sys/net/if_me.c
  head/sys/netinet/in_gif.c
  head/sys/netinet/ip_gre.c
  head/sys/netinet6/in6_gif.c
  head/sys/netinet6/ip6_gre.c

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