[Bug 234622] [libc] getgrent() issue with large NIS groups

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234622

            Bug ID: 234622
           Summary: [libc] getgrent() issue with large NIS groups
           Product: Base System
           Version: 11.2-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: tcleamy at ucdavis.edu

Created attachment 200779
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=200779&action=edit
Patch for 11.2

getgrent misses large NIS groups so the group list for those users is
incorrect.

To replicate simply make a large NIS group (500+ characters) and then run
groups on one of those users.  From one of my systems:
> ypmatch crc group
crc::499:ccctim,itsnoopy,rodd,jkperla,ncmolina,ajnichol,itlm003,itlm005,itlm011,itlm012,itlm019,itlm022,itlm023,itlm031,itlm032,itlm033,itlm034,itlm035,itlm038,itlm039,itlm040,itlm041,itlm043,itlm045,itlm046,itlm049,itlm054,itlm055,itlm057,itlm061,itlm064,itlm067,itlm068,itlm070,itlm071,itlm072,itlm076,itlm079,itlm080,itlm082,itlm084,itlm086,itlm087,itlm088,itlm089,itlm091,itlm092,itlm094,itlm095,itlm097,itlm098,itlm099,itlm100,itlm104,itlm107,itlm109,itlm111,itlm112,itlm113,itlm114,itlm123,itlm125,itlm126,itlm127,itlm130,itlm134,itlm138,itlm140,itlm141,itlm145,itlm146,itlm147,itlm151,itlm167,itlm179,itlm196,itlm197

> groups ccctim
users lm hws projects office eyevocab roomres crcsuper

So while "ypmatch crc group" lists the entire group including ccctim, "groups
ccctim" doesn't list crc.

I've seen this issue on various releases of FreeBSD 9, 10 & 11.  I think it's
the same as 96840.  That bug report says fixed and closed, but I'm continuing
to see the same issue.  I've been using that patch in 96840 to fix the bug each
release.  So can you double check to see if the issue was really fixed?

I've attached the latest patch for FreeBSD 11.2.

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