From d64a48b7fcf218da33f97cba9ec3339e78902e76 Mon Sep 17 00:00:00 2001
From: merlokk <807634+merlokk@users.noreply.github.com>
Date: Thu, 20 Dec 2018 23:05:02 +0200
Subject: [PATCH] added check Fi and Di

---
 client/cmdsmartcard.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/client/cmdsmartcard.c b/client/cmdsmartcard.c
index 8408b03ce..e4c161153 100644
--- a/client/cmdsmartcard.c
+++ b/client/cmdsmartcard.c
@@ -675,10 +675,14 @@ int CmdSmartInfo(const char *Cmd){
 	PrintAndLogEx(NORMAL, "Di=%d", Di);
 	PrintAndLogEx(NORMAL, "Fi=%d", Fi);
 	PrintAndLogEx(NORMAL, "F=%.1f MHz", F);
-	PrintAndLogEx(NORMAL, "Cycles/ETU=%d", Fi/Di);
-	PrintAndLogEx(NORMAL, "%.1f bits/sec at 4MHz", (float)4000000 / (Fi/Di));
-	PrintAndLogEx(NORMAL, "%.1f bits/sec at Fmax=%.1fMHz", (F * 1000000) / (Fi/Di), F);
-	
+	if (Di && Fi) {
+		PrintAndLogEx(NORMAL, "Cycles/ETU=%d", Fi/Di);
+		PrintAndLogEx(NORMAL, "%.1f bits/sec at 4MHz", (float)4000000 / (Fi/Di));
+		PrintAndLogEx(NORMAL, "%.1f bits/sec at Fmax=%.1fMHz", (F * 1000000) / (Fi/Di), F);
+	} else {
+		PrintAndLogEx(WARNING, "Di or Fi is RFU.");
+	};
+
 	return 0;
 }