From 4b4a467e0bb0d6abcd0ec2d172a2450e345f826d Mon Sep 17 00:00:00 2001
From: Alexey Tikhonov <atikhono@redhat.com>
Date: Tue, 12 Nov 2024 11:41:24 +0100
Subject: [PATCH] CLIENT: don't try to lookup `getservbyport(0, ...)`

'sssd_nss' won't handle this request anyway.
---
 src/sss_client/nss_services.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/sss_client/nss_services.c b/src/sss_client/nss_services.c
index 4f44cb29c03..53aa95fef05 100644
--- a/src/sss_client/nss_services.c
+++ b/src/sss_client/nss_services.c
@@ -292,6 +292,11 @@ _nss_sss_getservbyport_r(int port, const char *protocol,
 	return NSS_STATUS_TRYAGAIN;
     }
 
+    if (port == 0) {
+        *errnop = EINVAL;
+        return NSS_STATUS_NOTFOUND;
+    }
+
     if (protocol) {
         ret = sss_strnlen(protocol, SSS_NAME_MAX, &proto_len);
         if (ret != 0) {