From 7a236dc44a22dc4252e803d1ee1d3b970ec43805 Mon Sep 17 00:00:00 2001
From: Florian Weimer <fweimer@redhat.com>
Date: Tue, 30 Aug 2022 10:02:49 +0200
Subject: [PATCH 132/138] nss_dns: In gaih_getanswer_slice, skip strange
 aliases (bug 12154)

If the name is not a host name, skip adding it to the result, instead
of reporting query failure.  This fixes bug 12154 for getaddrinfo.

This commit still keeps the old parsing code, and only adjusts when
a host name is copied.

Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
(cherry picked from commit 32b599ac8c21c4c332cc3900a792a1395bca79c7)
---
 resolv/nss_dns/dns-host.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/resolv/nss_dns/dns-host.c b/resolv/nss_dns/dns-host.c
index b887e77e9cc1..bea505d69724 100644
--- a/resolv/nss_dns/dns-host.c
+++ b/resolv/nss_dns/dns-host.c
@@ -970,12 +970,12 @@ gaih_getanswer_slice (const querybuf *answer, int anslen, const char *qname,
 
 	  n = -1;
 	}
-      if (__glibc_unlikely (n < 0 || __libc_res_hnok (buffer) == 0))
+      if (__glibc_unlikely (n < 0))
 	{
 	  ++had_error;
 	  continue;
 	}
-      if (*firstp && canon == NULL)
+      if (*firstp && canon == NULL && __libc_res_hnok (buffer))
 	{
 	  h_name = buffer;
 	  buffer += h_namelen;
@@ -1021,14 +1021,14 @@ gaih_getanswer_slice (const querybuf *answer, int anslen, const char *qname,
 
 	  n = __libc_dn_expand (answer->buf, end_of_message, cp,
 				tbuf, sizeof tbuf);
-	  if (__glibc_unlikely (n < 0 || __libc_res_hnok (tbuf) == 0))
+	  if (__glibc_unlikely (n < 0))
 	    {
 	      ++had_error;
 	      continue;
 	    }
 	  cp += n;
 
-	  if (*firstp)
+	  if (*firstp && __libc_res_hnok (tbuf))
 	    {
 	      /* Reclaim buffer space.  */
 	      if (h_name + h_namelen == buffer)
-- 
2.37.3