[Bug libc/23679] gethostid: Missing NULL check for gethostbyname_r result

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=23679

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=307d04334d516bb180f484a2b283f97310bfee66

commit 307d04334d516bb180f484a2b283f97310bfee66
Author: Florian Weimer <fweimer@redhat.com>
Date:   Thu Sep 20 12:03:01 2018 +0200

    misc: New test misc/tst-gethostid

    The empty /etc/hosts file used to trigger bug 23679.

    (cherry picked from commit db9a8ad4ff3fc58e3773a9a4d0cabe3c1bc9c94c)

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=e7d22db29cfdd2f1fb97a70a76fa53d151569945

commit e7d22db29cfdd2f1fb97a70a76fa53d151569945
Author: Mingli Yu <Mingli.Yu@windriver.com>
Date:   Thu Sep 20 12:41:13 2018 +0200

    Linux gethostid: Check for NULL value from gethostbyname_r [BZ #23679]

    A NULL value can happen with certain gethostbyname_r failures.

    (cherry picked from commit 1214ba06e6771acb953a190091b0f6055c64fd25)

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog                           |   11 ++++
 NEWS                                |    1 +
 misc/Makefile                       |    7 ++
 misc/tst-gethostid.c                |  108 +++++++++++++++++++++++++++++++++++
 sysdeps/unix/sysv/linux/gethostid.c |    4 +-
 5 files changed, 129 insertions(+), 2 deletions(-)
 create mode 100644 misc/tst-gethostid.c

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