From a2b846be2f1f829d744132b20b53c5599289cd9b Mon Sep 17 00:00:00 2001
From: Alexander Couzens <lynxis@fe80.eu>
Date: Tue, 7 Sep 2021 15:30:02 +0200
Subject: [PATCH] ns2: ensure the NSVC is in the correct mode for NSVC
 UNKNOWN/NSVC BLOCKED cause codes

Those cause codes are only valid for BLOCK/RESET NSVCs.

Change-Id: I560f1c8c2826befd03641bebffe156ac070061c2
---
 src/gb/gprs_ns2_message.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/gb/gprs_ns2_message.c b/src/gb/gprs_ns2_message.c
index 90873ed34..de30470b2 100644
--- a/src/gb/gprs_ns2_message.c
+++ b/src/gb/gprs_ns2_message.c
@@ -103,6 +103,11 @@ static int ns2_validate_status(struct gprs_ns2_vc *nsvc, struct msgb *msg, struc
 			*cause = NS_CAUSE_MISSING_ESSENT_IE;
 			return -1;
 		}
+
+		if (nsvc->mode != GPRS_NS2_VC_MODE_BLOCKRESET) {
+			*cause = NS_CAUSE_PDU_INCOMP_PSTATE;
+			return -1;
+		}
 		break;
 	case NS_CAUSE_SEM_INCORR_PDU:
 	case NS_CAUSE_PDU_INCOMP_PSTATE: