From 1f46f07e3c1d793ca334520786fad4ec90e83916 Mon Sep 17 00:00:00 2001
From: Philipp Maier <pmaier@sysmocom.de>
Date: Thu, 27 Jul 2023 10:38:38 +0200
Subject: [PATCH] utils: tolerate uninitialized fields in dec_addr_tlv

TLV fields holding an address may still be uninitialized and hence
filled with 0xff bytes. Lets interpret those fields in the same way as
we interpret empty fields.

Related: OS#6094
Change-Id: Idc0a92ea88756266381c8da2ad62de061a8ea7a1
---
 pySim/utils.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/pySim/utils.py b/pySim/utils.py
index 735468e8..1541e2e6 100644
--- a/pySim/utils.py
+++ b/pySim/utils.py
@@ -771,6 +771,10 @@ def dec_addr_tlv(hexstr):
         if tlv[1] == 0:
             continue
 
+        # Uninitialized field
+        if all([v == 0xff for v in tlv[2]]):
+            continue
+
         # First byte in the value has the address type
         addr_type = tlv[2][0]
         # TODO: Support parsing of IPv6