Merge pull request #469 from padelsbach/padelsbach/finding-tpm2-wrap

Address findings in tpm2_wrap.c

Author: dgarske

.gitignore

@@ -60,6 +60,8 @@ pkcs7tpmsignedex.p7s
 examples/tls/tls_server
 examples/tls/tls_client_notpm
 tests/unit.test
+tests/unit.log
+unit.trs
 examples/keygen/create_primary
 examples/keygen/keyload
 examples/keygen/keygen

examples/wrap/wrap_test.c

@@ -989,7 +989,7 @@ int TPM2_Wrapper_TestArgs(void* userCtx, int argc, char *argv[])
     /* PCR TESTS */
     /*------------------------------------------------------------------------*/
     /* Read PCR Index 0 */
-    hashSz = 0;
+    hashSz = sizeof(hashBuf);
     rc = wolfTPM2_ReadPCR(&dev, 0, TEST_WRAP_DIGEST, hashBuf, &hashSz);
     if (rc != 0) goto exit;
 
@@ -1001,6 +1001,7 @@ int TPM2_Wrapper_TestArgs(void* userCtx, int argc, char *argv[])
     if (rc != 0 && !WOLFTPM_IS_COMMAND_UNAVAILABLE(rc)) goto exit;
 
     /* Read PCR Index 0 */
+    hashSz = sizeof(hashBuf);
     rc = wolfTPM2_ReadPCR(&dev, 0, TEST_WRAP_DIGEST, hashBuf, &hashSz);
     if (rc != 0) goto exit;
     printf("PCR Test pass\n");