patch for libvirt-nss 9.3.0, fixing issues where guest names resolving to hosts on other networks when the application prefers ipv6

0001-nss-return-success-when-host-is-found-but-no-data-av.patch

From 18c1445c291ecab84700f6806ff90b4151586e96 Mon Sep 17 00:00:00 2001
From: Jiang XueQian <[email protected]>
Date: Mon, 10 Jul 2023 15:06:59 +0800
Subject: [PATCH] nss: return success when host is found but no data available

---
 tools/nss/libvirt_nss.c | 21 ++++++++-------------
 1 file changed, 8 insertions(+), 13 deletions(-)

diff --git a/tools/nss/libvirt_nss.c b/tools/nss/libvirt_nss.c
index ec7763224b..970e65d545 100644
--- a/tools/nss/libvirt_nss.c
+++ b/tools/nss/libvirt_nss.c
@@ -279,16 +279,14 @@ NSS_NAME(gethostbyname3)(const char *name, int af, struct hostent *result,
         *errnop = ESRCH;
         *herrnop = HOST_NOT_FOUND;
         return NSS_STATUS_NOTFOUND;
-    } else if (!naddr) {
-        /* Found, but no data */
-        *errnop = ENXIO;
-        *herrnop = NO_DATA;
-        return NSS_STATUS_UNAVAIL;
     }
 
     /* Found and have data */
 
-    alen = FAMILY_ADDRESS_SIZE(addr[0].af);
+    if (naddr > 0)
+        alen = FAMILY_ADDRESS_SIZE(addr[0].af);
+    else
+        alen = 0;
 
     nameLen = strlen(name);
     /* We need space for:
@@ -354,7 +352,8 @@ NSS_NAME(gethostbyname3)(const char *name, int af, struct hostent *result,
 
     ret = NSS_STATUS_SUCCESS;
  cleanup:
-    free(addr);
+    if (addr)
+        free(addr);
     return ret;
 }
 
@@ -389,11 +388,6 @@ NSS_NAME(gethostbyname4)(const char *name, struct gaih_addrtuple **pat,
         *errnop = ESRCH;
         *herrnop = HOST_NOT_FOUND;
         return NSS_STATUS_NOTFOUND;
-    } else if (!naddr) {
-        /* Found, but no data */
-        *errnop = ENXIO;
-        *herrnop = NO_DATA;
-        return NSS_STATUS_UNAVAIL;
     }
 
     /* Found and have data */
@@ -448,7 +442,8 @@ NSS_NAME(gethostbyname4)(const char *name, struct gaih_addrtuple **pat,
     *herrnop = NETDB_SUCCESS;
     ret = NSS_STATUS_SUCCESS;
  cleanup:
-    free(addr);
+    if (addr)
+        free(addr);
     return ret;
 }
 #endif /* WITH_STRUCT_GAIH_ADDRTUPLE */
-- 
2.39.3