From: mwalker33 <mwal5099@bigpond.net.au>
Date: Sat, 6 Jul 2019 19:00:08 +0000 (+1000)
Subject: Update lfops.c
X-Git-Url: http://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/commitdiff_plain/bdc97796459e46419e72468b2e92d46f0a10a56e

Update lfops.c

boundary length check
---

diff --git a/armsrc/lfops.c b/armsrc/lfops.c
index c6aecf0f..ed83df48 100644
--- a/armsrc/lfops.c
+++ b/armsrc/lfops.c
@@ -1420,7 +1420,7 @@ void T55xx_SendCMD (uint32_t Data, uint32_t Block, uint32_t Pwd, uint8_t arg) {
 	if (downlink_mode ==  T55xx_DLMode_LLR) 
 		T55xxWriteBit (T55xx_LongLeadingReference,Timing); // Send Long Leading Start Reference
 
-   if (downlink_mode ==  T55xx_DLMode_1of4) { // 1 of 4 need to send 2 bits at a time
+   if ((downlink_mode ==  T55xx_DLMode_1of4) && (BitStreamLen > 0)) { // 1 of 4 need to send 2 bits at a time
 		for ( i = 0; i < BitStreamLen-1; i+=2 ) {
 			SendBits  = (BitStream[BitStream_Byte(i  )] >> (BitStream_Bit(i  )) & 1) << 1;   // Bit i
             SendBits += (BitStream[BitStream_Byte(i+1)] >> (BitStream_Bit(i+1)) & 1);        // Bit i+1;