diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index 5200d90..dbbd6f2 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -3376,6 +3376,10 @@
     if( ret != 0 )
         goto cleanup;
 
+    /* If ssl->conf->endpoint is not one of MBEDTLS_SSL_IS_CLIENT or
+     * MBEDTLS_SSL_IS_SERVER, this is the return code we give */
+    ret = MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
+
 #if defined(MBEDTLS_SSL_CLI_C)
     if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
     {
@@ -3386,6 +3390,7 @@
         {
             case MBEDTLS_SSL_HELLO_REQUEST:
                 ssl->state = MBEDTLS_SSL_CLIENT_HELLO;
+                ret = 0;
                 break;
 
             case MBEDTLS_SSL_CLIENT_HELLO: