From 565b73bbe457f2def84493bc4be12e9c59ce0f7e Mon Sep 17 00:00:00 2001
From: MadAlexUK <44322503+MadAlexUK@users.noreply.github.com>
Date: Fri, 7 Dec 2018 01:21:18 +0000
Subject: [PATCH] Corrected segfault in TLS SNI code with OpenSSL in the case
 that callbacks are not used. (#315)

---
 src/data-types/mailstream_ssl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/data-types/mailstream_ssl.c b/src/data-types/mailstream_ssl.c
index e15d8563..a6901523 100644
--- a/src/data-types/mailstream_ssl.c
+++ b/src/data-types/mailstream_ssl.c
@@ -468,7 +468,7 @@ static struct mailstream_ssl_data * ssl_data_new_full(int fd, time_t timeout,
     goto free_ctx;
 
 #if (OPENSSL_VERSION_NUMBER >= 0x10000000L)
-  if (ssl_context->server_name != NULL) {
+  if (ssl_context != NULL && ssl_context->server_name != NULL) {
     SSL_set_tlsext_host_name(ssl_conn, ssl_context->server_name);
     free(ssl_context->server_name);
     ssl_context->server_name = NULL;