[Bug 238725] Severe NFS exports(5) -maproot regression for :group definition

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238725

--- Comment #3 from commit-hook at freebsd.org ---
A commit references this bug:

Author: mav
Date: Tue Jun 25 17:00:54 UTC 2019
New revision: 349376
URL: https://svnweb.freebsd.org/changeset/base/349376

Log:
  Fix strsep_quote() on strings without quotes.

  For strings without quotes and escapes dstptr and srcptr are equal, so
  zeroing *dstptr before checking *srcptr is not a good idea.  In practice
  it means that in -maproot=65534:65533 everything after the colon is lost.

  The problem was there since r293305, but before r346976 it was covered by
  improper strsep_quote() usage.

  PR:           238725
  MFC after:    3 days
  Sponsored by: iXsystems, Inc.

Changes:
  head/usr.sbin/mountd/mountd.c

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