NFC TRT Parser: Additional checks to prevent false positives (#3966)

* additional checks to prevent false positives * Update trt.c Co-authored-by: あく <alleteam@gmail.com>
flipperdevices · Oct 20, 2024 · f8fa71c · f8fa71c
1 parent 1822221
commit f8fa71c
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/applications/main/nfc/plugins/supported_cards/trt.c b/applications/main/nfc/plugins/supported_cards/trt.c
@@ -40,7 +40,10 @@ static bool trt_parse(const NfcDevice* device, FuriString* parsed_data) {
         const uint8_t* full_record_pointer = &data->page[FULL_SALE_TIME_STAMP_PAGE].data[0];
         uint32_t latest_sale_record = bit_lib_get_bits_32(partial_record_pointer, 3, 20);
         uint32_t latest_sale_full_record = bit_lib_get_bits_32(full_record_pointer, 0, 27);
-        if(latest_sale_record != (latest_sale_full_record & 0xFFFFF)) break;
+        if(latest_sale_record != (latest_sale_full_record & 0xFFFFF))
+            break; // check if the copy matches
+        if((latest_sale_record == 0) || (latest_sale_full_record == 0))
+            break; // prevent false positive
 
         // Parse date
         // yyy yyyymmmm dddddhhh hhnnnnnn