From 93326a7aeb46c48c1b61aec0077cb6a298c98908 Mon Sep 17 00:00:00 2001
From: Stanislav Klima <sklima@ra.rockwell.com>
Date: Tue, 10 Mar 2020 09:55:27 +0100
Subject: [PATCH] Changed dst NULL check.

---
 src/ssl.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/ssl.c b/src/ssl.c
index b418f7f80..e7d099a10 100644
--- a/src/ssl.c
+++ b/src/ssl.c
@@ -17094,7 +17094,11 @@ int wolfSSL_EVP_MD_type(const WOLFSSL_EVP_MD *md)
         int ret = 0;
         WOLFSSL_ENTER("wolfSSL_EVP_Cipher");
 
-        if (ctx == NULL || dst == NULL || src == NULL) {
+        if (ctx == NULL || src == NULL ||
+            (dst == NULL &&
+             ctx->cipherType != AES_128_GCM_TYPE &&
+             ctx->cipherType != AES_192_GCM_TYPE &&
+             ctx->cipherType != AES_256_GCM_TYPE)) {
             WOLFSSL_MSG("Bad function argument");
             return 0;  /* failure */
         }