chg: unsigned byte can't be less than zero.

2019-03-18 13:41:59 +01:00
parent 027cda47d2
commit dcec5627d1
1 changed files with 1 additions and 1 deletions
--- a/armsrc/desfire_crypto.c
+++ b/armsrc/desfire_crypto.c
@@ -313,7 +313,7 @@ void *mifare_cryto_postprocess_data(desfiretag_t tag, void *data, size_t *nbytes
                case AS_LEGACY:
                    if (communication_settings & MAC_VERIFY) {
                        *nbytes -= key_macing_length(key);
-                        if (*nbytes <= 0) {
+                        if (*nbytes == 0) {
                            *nbytes = -1;
                            res = NULL;
 #ifdef WITH_DEBUG