[Bug nss/20237] nss_db: get*ent segfaults without preceding set*ent

["cvs-commit at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=20237

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=809cde4a640032f2f87319c9358be4fee8d6d7d5

commit 809cde4a640032f2f87319c9358be4fee8d6d7d5
Author: Florian Weimer <fweimer@redhat.com>
Date:   Sat Jun 11 12:12:56 2016 +0200

    nss_db: Fix initialization of iteration position [BZ #20237]

    When get*ent is called without a preceding set*ent, we need
    to set the initial iteration position in get*ent.

    Reproducer: Add “services: db files” to /etc/nsswitch.conf, then run
    “perl -e getservent”.  It will segfault before this change, and exit
    silently after it.

    (cherry picked from commit 31d0a4fa646db8b8c97ce24e0ec0a7b73de4fca1)

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

Summary of changes:
 ChangeLog           |    7 +++++++
 nss/nss_db/db-XXX.c |    8 +++++++-
 2 files changed, 14 insertions(+), 1 deletions(-)

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