From ae21c03d6902e9e52e626f6230ce641e659efcb0 Mon Sep 17 00:00:00 2001
From: Jacob Barthelmeh <jacob@wolfssl.com>
Date: Thu, 1 Mar 2018 10:03:20 -0700
Subject: [PATCH] check on certificate index when getting Name

---
 wolfcrypt/src/asn.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/wolfcrypt/src/asn.c b/wolfcrypt/src/asn.c
index d71db8707..9d2e7f66b 100755
--- a/wolfcrypt/src/asn.c
+++ b/wolfcrypt/src/asn.c
@@ -4102,6 +4102,10 @@ static int GetName(DecodedCert* cert, int nameType)
         hash = cert->subjectHash;
     }
 
+    if (cert->srcIdx >= cert->maxIdx) {
+        return BUFFER_E;
+    }
+
     if (cert->source[cert->srcIdx] == ASN_OBJECT_ID) {
         WOLFSSL_MSG("Trying optional prefix...");