diff -Naur yubico-piv-tool-2.3.0.org/ykcs11/tests/ykcs11_tests_util.c yubico-piv-tool-2.3.0/ykcs11/tests/ykcs11_tests_util.c
--- yubico-piv-tool-2.3.0.org/ykcs11/tests/ykcs11_tests_util.c	2022-06-29 10:40:32.725836092 +0200
+++ yubico-piv-tool-2.3.0/ykcs11/tests/ykcs11_tests_util.c	2022-02-23 14:54:47.000000000 +0100
@@ -1224,7 +1223,6 @@
       asrt(funcs->C_Decrypt(session, enc, enc_len, dec, &dec_len), CKR_OK, "DECRYPT");
       asrt(dec_len, data_len, "DECRYPTED DATA LEN");
       asrt(memcmp(data, dec, dec_len), 0, "DECRYPTED DATA");
-      free(dec);
 
       // Decrypt Update
       asrt(funcs->C_DecryptInit(session, &mech, obj_pvtkey[i]), CKR_OK, "DECRYPT INIT");
@@ -1234,6 +1234,8 @@
       asrt(funcs->C_DecryptUpdate(session, enc+100, 8, dec, &dec_len), CKR_OK, "DECRYPT UPDATE");
       dec_len = sizeof(dec);
       asrt(funcs->C_DecryptUpdate(session, enc+108, 20, dec, &dec_len), CKR_OK, "DECRYPT UPDATE");
+      free(dec);
+
       dec_len = 0;
       asrt(funcs->C_DecryptFinal(session, NULL, &dec_len), CKR_OK, "DECRYPT FINAL");
       dec = malloc(dec_len);