Bug 474800

Description of problem:
Call to _nss_nis_gethostbyname4_r() in nis/nss_nis/nis-hosts.c segfaults for host names without domain suffix, e.g. "somehost" instead of "somehost.somedomain.com".
The actual offender is line 490
int parse_res = parse_line (result, &host, &data, buflen, errnop, AF_UNSPEC, 0);
which returns host (of type struct hostent) empty, so that
in line 528
size_t h_name_len = strlen (host.h_name);
segfaults, because host.h_name is a null pointer

Version-Release number of selected component (if applicable):
glibc 2.9.2

How reproducible:
always
$ ssh <hostname>

Steps to Reproduce:
1.
/etc/nsswitch.conf
...
hosts:      files nis dns
...
2.
$ ssh <hostname>
where <hostname> lacks a domain suffix and needs to be resolved over nis,
i.e. is not found in /etc/hosts

Actual results:
Segmentation fault


Expected results:
the result should be the same as for
$ ssh <hostname.domainname>
i.e. no segfault