[Bug network/19787] Missing and incorrect truncation checks in getnameinfo

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

https://sourceware.org/bugzilla/show_bug.cgi?id=19787

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=f8020794aea5d4feb38683fc8301ee04a4fc4759

commit f8020794aea5d4feb38683fc8301ee04a4fc4759
Author: Florian Weimer <fweimer@redhat.com>
Date:   Wed May 4 14:45:17 2016 +0200

    getnameinfo: Return EAI_OVERFLOW in more cases [BZ #19787]

    The AF_LOCAL and AF_INET/AF_INET6 non-numerci service conversion
    did not return EAI_OVERFLOW if the supplied buffer was too small,
    silently returning truncated data.  In the AF_INET/AF_INET6
    numeric cases, the snprintf return value checking was incorrect.

    (cherry picked from commit 066746783d6c6c0f61b39c741177e24a9b398a20)

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=05d2606fa110a8afd85419d969a6d55bf88efb0f

commit 05d2606fa110a8afd85419d969a6d55bf88efb0f
Author: Florian Weimer <fweimer@redhat.com>
Date:   Wed May 4 14:35:23 2016 +0200

    getnameinfo: Avoid calling strnlen on uninitialized buffer

    In the numeric AF_INET/AF_INET6 case, if inet_ntop fails
    as the result of a short host buffer, we used to call strnlen
    on the uninitialized host buffer.

    (cherry picked from commit 1c3490d4b29fc5b3f30dd6b13082046aee94443d)

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=c5aae1035cac6305a111e3461af23a924914d9f5

commit c5aae1035cac6305a111e3461af23a924914d9f5
Author: Florian Weimer <fweimer@redhat.com>
Date:   Wed May 4 14:35:12 2016 +0200

    getnameinfo: Reduce line length and add missing comments

    (cherry picked from commit c9b0e6a432e827b61f12eb52c2aaeadc77b64461)

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

Summary of changes:
 ChangeLog          |   26 +++++++++
 inet/getnameinfo.c |  147 +++++++++++++++++++++++++---------------------------
 2 files changed, 97 insertions(+), 76 deletions(-)

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