From 33c795d0bd0ba50616072a806fd5b38e1e2ccaef Mon Sep 17 00:00:00 2001
From: marshmellow42 <marshmellowrf@gmail.com>
Date: Sun, 14 Feb 2016 11:07:16 -0500
Subject: [PATCH] add check to fread call

---
 client/cmdhficlass.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/client/cmdhficlass.c b/client/cmdhficlass.c
index 6c85e1c1..59b0ddc3 100644
--- a/client/cmdhficlass.c
+++ b/client/cmdhficlass.c
@@ -1046,7 +1046,11 @@ int CmdHFiClassCloneTag(const char *Cmd) {
 	// else we have to create a share memory
 	int i;
 	fseek(f,startblock*8,SEEK_SET);
-	fread(tag_data,sizeof(iclass_block_t),endblock - startblock + 1,f);
+	if ( fread(tag_data,sizeof(iclass_block_t),endblock - startblock + 1,f) == 0 ) {
+		PrintAndLog("File reading error.");
+		fclose(f);
+		return 2;
+	}
 
 	uint8_t MAC[4]={0x00,0x00,0x00,0x00};
 	uint8_t div_key[8]={0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};
-- 
2.39.5