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From: Florian Weimer <fw@sourceware.org>
To: glibc-cvs@sourceware.org
Subject: [glibc] nis: nis_local_group may read from __nisgroup[-1] (bug 28075)
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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=70099c7763b8c47a4bb1eef1c41601c602a83270

commit 70099c7763b8c47a4bb1eef1c41601c602a83270
Author: Florian Weimer <fweimer@redhat.com>
Date:   Mon Jul 12 07:58:07 2021 +0200

    nis: nis_local_group may read from __nisgroup[-1] (bug 28075)
    
    Reviewed-by: Carlos O'Donell <carlos@redhat.com>

Diff:
---
 nis/nis_local_names.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/nis/nis_local_names.c b/nis/nis_local_names.c
index 080dcf88bd..218764f32e 100644
--- 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);