ADD: since the client now calls legic prng, this is needed here too.

[proxmark3-svn] / common / lfdemod.c

diff --git a/common/lfdemod.c b/common/lfdemod.c
index 27bef1dd2b7e860153a8bdf3804399e0050d5e1f..f231cd69fd54e787506cea2cee9f4d022cf87e0a 100644 (file)
--- a/common/lfdemod.c
+++ b/common/lfdemod.c
@@ -148,6 +148,9 @@ uint32_t bytebits_to_byteLSBF(uint8_t *src, size_t numbits)
 //search for given preamble in given BitStream and return success=1 or fail=0 and startIndex and length
 uint8_t preambleSearch(uint8_t *BitStream, uint8_t *preamble, size_t pLen, size_t *size, size_t *startIdx)
 {
+       // Sanity check.  If preamble length is bigger than bitstream length.
+       if ( *size <= pLen ) return 0;
+       
        uint8_t foundCnt = 0;
        for (int idx = 0; idx < *size - pLen; idx++){
                if (memcmp(BitStream+idx, preamble, pLen) == 0){