From e8ae8e7739bd937459ff7efe0630ea2f565731f5 Mon Sep 17 00:00:00 2001
From: Stefan `Sec` Zehl <sec@42.org>
Date: Sat, 22 Feb 2025 11:43:30 +0100
Subject: [PATCH] [reassembler] pcap: don't die due to wrong frequency

---
 iridiumtk/reassembler/ida.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/iridiumtk/reassembler/ida.py b/iridiumtk/reassembler/ida.py
index 177be65..ab8eee3 100755
--- a/iridiumtk/reassembler/ida.py
+++ b/iridiumtk/reassembler/ida.py
@@ -992,6 +992,9 @@ def gsmwrap(self,q):
 
         fchan, foff = channelize(freq)
 
+        if fchan < 0: # Can happen if frequencies are off
+            fchan += 0x2000
+
         # GSMTAP:
         #
         #struct gsmtap_hdr {