From edeb7b8f6175668347dbdb6cb48d79aab930a3a9 Mon Sep 17 00:00:00 2001
From: batuhan duyuler <batuhan.duyuler@firecell.io>
Date: Tue, 29 Oct 2024 11:26:01 +0100
Subject: [PATCH] handling 1st digit of mnc in SIB1

During preparation of SIB1, first digit of MNC was not taking into account.
This leads to XRES*, RES* mismatch during Authentication Procedure between 5GCore and UE because of derived serving network names.
---
 openair2/RRC/NR/nr_rrc_config.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/openair2/RRC/NR/nr_rrc_config.c b/openair2/RRC/NR/nr_rrc_config.c
index dab37f6f1a..2f42652338 100644
--- a/openair2/RRC/NR/nr_rrc_config.c
+++ b/openair2/RRC/NR/nr_rrc_config.c
@@ -2209,7 +2209,7 @@ NR_BCCH_DL_SCH_Message_t *get_SIB1_NR(const NR_ServingCellConfigCommon_t *scc,
     int mnc = plmn->mnc;
     if (plmn->mnc_digit_length == 3) {
       asn1cSequenceAdd(nr_plmn->mnc.list, NR_MCC_MNC_Digit_t, mnc0);
-      *mnc0 = (0 / 100) % 10;
+      *mnc0 = (mnc / 100) % 10;
     }
     asn1cSequenceAdd(nr_plmn->mnc.list, NR_MCC_MNC_Digit_t, mnc1);
     *mnc1 = (mnc / 10) % 10;