From bb6582896d0b5910e694f003d6b207e63396e36f Mon Sep 17 00:00:00 2001
From: Jacob Barthelmeh <jacob@wolfssl.com>
Date: Thu, 15 Jun 2017 11:55:37 -0600
Subject: [PATCH] add sanity check for wolfSSL_X509_NAME_oneline function

---
 src/ssl.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/src/ssl.c b/src/ssl.c
index 9c5207f45..5b93ed2e3 100755
--- a/src/ssl.c
+++ b/src/ssl.c
@@ -13523,7 +13523,14 @@ static void ExternalFreeX509(WOLFSSL_X509* x509)
        malloc buffer, call responsible for freeing                     */
     char* wolfSSL_X509_NAME_oneline(WOLFSSL_X509_NAME* name, char* in, int sz)
     {
-        int copySz = min(sz, name->sz);
+        int copySz;
+
+        if (name == NULL) {
+            WOLFSSL_MSG("WOLFSSL_X509_NAME pointer was NULL");
+            return NULL;
+        }
+
+        copySz = min(sz, name->sz);
 
         WOLFSSL_ENTER("wolfSSL_X509_NAME_oneline");
         if (!name->sz) return in;
@@ -13539,7 +13546,7 @@ static void ExternalFreeX509(WOLFSSL_X509* x509)
         #endif
         }
 
-        if (copySz == 0)
+        if (copySz <= 0)
             return in;
 
         XMEMCPY(in, name->name, copySz - 1);