From af6fdd09e209302f2d339c8d57e759a9a5deaf2f Mon Sep 17 00:00:00 2001
From: iceman1001 <iceman@iuse.se>
Date: Tue, 18 Feb 2025 18:43:10 +0100
Subject: [PATCH] make sure variable are set before being used

---
 client/src/cmdlfem410x.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/client/src/cmdlfem410x.c b/client/src/cmdlfem410x.c
index ecb252ffc..145392eb7 100644
--- a/client/src/cmdlfem410x.c
+++ b/client/src/cmdlfem410x.c
@@ -108,6 +108,8 @@ static void em410x_construct_emul_graph(uint8_t *uid, uint8_t clock, uint8_t gap
 // print 64 bit EM410x ID in multiple formats
 void printEM410x(uint32_t hi, uint64_t id, bool verbose, int type) {
 
+    if (!id && !hi) return;
+
     if (verbose == false) {
         if (type & 0x1) { // Short ID
             PrintAndLogEx(SUCCESS, "EM 410x ID "_GREEN_("%010" PRIX64), id);
@@ -252,6 +254,11 @@ static int ask_em410x_binary_decode(bool verbose, uint32_t *hi, uint64_t *lo, ui
         return PM3_ESOFT;
     }
 
+    if (!lo && !hi) {
+        PrintAndLogEx(DEBUG, "DEBUG: Error - Em410x decoded to all zeros");
+        return PM3_ESOFT;
+    }
+
     PrintAndLogEx(DEBUG, "DEBUG: Em410x idx: %zu, Len: %zu, Printing DemodBuffer:", *idx, *size);
     if (g_debugMode) {
         printDemodBuff(0, false, false, true);