From: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date: Wed, 23 Apr 2025 19:40:57 +0000 (-0300)
Subject: nss: Fix UB on test-netdb
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6a180670f8146c3f7397b29c553780fa0085b0c2;p=thirdparty%2Fglibc.git

nss: Fix UB on test-netdb

The gethostname is defined as not accepting NULL arguments, so
use a minimal size for initial call.
---

diff --git a/nss/test-netdb.c b/nss/test-netdb.c
index 3911c3c42a..b7125cfed1 100644
--- a/nss/test-netdb.c
+++ b/nss/test-netdb.c
@@ -178,6 +178,9 @@ test_hosts (void)
   hptr1 = gethostbyname2 ("localhost", AF_INET);
   output_hostent ("gethostbyname2 (\"localhost\", AF_INET)", hptr1);
 
+  name = xmalloc (2);
+  namelen += 2;
+
   while (gethostname (name, namelen) < 0 && errno == ENAMETOOLONG)
     {
       namelen += 2;		/* tiny increments to test a lot */