nis: nis_local_group may read from __nisgroup[-1] (bug 28075)

Reviewed-by: Carlos O'Donell <carlos@redhat.com>

diff --git a/nis/nis_local_names.c b/nis/nis_local_names.c
index 080dcf88bd67d5d0cb9d76bca3cbd01ace39c863..218764f32e99ffc1064ff305c1dab8fc5b907a38 100644 (file)
--- a/nis/nis_local_names.c
+++ b/nis/nis_local_names.c
@@ -31,6 +31,7 @@ nis_local_group (void)
   char *cptr;
   if (__nisgroup[0] == '\0'
       && (cptr = getenv ("NIS_GROUP")) != NULL
+      && cptr[0] != '\0'
       && strlen (cptr) < NIS_MAXNAMELEN)
     {
       char *cp = stpcpy (__nisgroup, cptr);