diff --git a/tests/quic.c b/tests/quic.c
index 3b1f2f7fb3..c2a12888e5 100644
--- a/tests/quic.c
+++ b/tests/quic.c
@@ -346,6 +346,7 @@ static int test_provide_quic_data(void) {
     len = fake_record(1, 100, lbuffer);
     ExpectTrue(provide_data(ssl, wolfssl_encryption_initial, lbuffer, len, 1));
     wolfSSL_free(ssl);
+    ssl = NULL;
 
     ExpectNotNull(ssl = wolfSSL_new(ctx));
     len = fake_record(1, 100, lbuffer);
diff --git a/tests/unit.c b/tests/unit.c
index 6bc6bda131..540dd800fe 100644
--- a/tests/unit.c
+++ b/tests/unit.c
@@ -209,7 +209,7 @@ int unit_test(int argc, char** argv)
             goto exit;
         }
         else if (XSTRCMP(argv[1], "--group") == 0) {
-            if (argc == 1) {
+            if (argc == 2) {
                 fprintf(stderr, "No group name supplied\n");
                 ret = -1;
                 goto exit;
diff --git a/wolfcrypt/src/des3.c b/wolfcrypt/src/des3.c
index 7a9ba3bc7f..c4593c2265 100644
--- a/wolfcrypt/src/des3.c
+++ b/wolfcrypt/src/des3.c
@@ -1742,6 +1742,10 @@
     {
         word32 blocks = sz / DES_BLOCK_SIZE;
 
+        if (des == NULL || out == NULL || in == NULL) {
+            return BAD_FUNC_ARG;
+        }
+
         while (blocks--) {
             XMEMCPY(des->tmp, in, DES_BLOCK_SIZE);
             DesProcessBlock(des, (byte*)des->tmp, out);