From 76b84a9b61e50a543bcbae5c7d4b13d247e766ea Mon Sep 17 00:00:00 2001
From: Andre Puschmann <andre@softwareradiosystems.com>
Date: Fri, 24 May 2019 15:21:21 +0200
Subject: [PATCH] fix unpacking of deactivate eps bearer context

---
 lib/src/asn1/liblte_mme.cc | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/lib/src/asn1/liblte_mme.cc b/lib/src/asn1/liblte_mme.cc
index 9d417c8d8..7fdf72b78 100644
--- a/lib/src/asn1/liblte_mme.cc
+++ b/lib/src/asn1/liblte_mme.cc
@@ -9967,6 +9967,15 @@ LIBLTE_ERROR_ENUM liblte_mme_unpack_deactivate_eps_bearer_context_request_msg(LI
     if(msg                          != NULL &&
        deact_eps_bearer_context_req != NULL)
     {
+        // Security Header Type
+        uint8_t sec_hdr_type = (msg->msg[0] & 0xF0) >> 4;
+        if(LIBLTE_MME_SECURITY_HDR_TYPE_PLAIN_NAS == sec_hdr_type)
+        {
+            msg_ptr++;
+        }else{
+            msg_ptr += 6;
+        }
+
         // EPS Bearer ID
         deact_eps_bearer_context_req->eps_bearer_id = (*msg_ptr >> 4);
         msg_ptr++;