[Bug network/19831] nss_dns: getaddrinfo returns uninitialized data when confronted with A/AAAA records of invalid size

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https://sourceware.org/bugzilla/show_bug.cgi?id=19831

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=730244f49ad8f46308f5513e58365eed370423cb

commit 730244f49ad8f46308f5513e58365eed370423cb
Author: Florian Weimer <fweimer@redhat.com>
Date:   Wed Apr 27 16:39:12 2016 +0200

    nss_dns: Check address length before creating addrinfo result [BZ #19831]

    Previously, we allocated room in the result space before the check,
    leaving uninitialized data there in case the check failed.

    This also consolidates the behavior between single (A or AAAA) and
    dual (A and AAAA in parallel) queries.  Single queries checked
    the record length against the QTYPE, not the RRTYPE.

    (cherry picked from commit 5e0c421cc07e2d06945b863ed3bb92395472705d)

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

Summary of changes:
 ChangeLog                 |    8 ++++++
 resolv/nss_dns/dns-host.c |   59 +++++++++++++++++++++++++++++---------------
 2 files changed, 47 insertions(+), 20 deletions(-)

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