From f5c463148f2d0c0a2a535fad2bfd8f25452c31e5 Mon Sep 17 00:00:00 2001
From: Juliusz Sosinowicz <juliusz@wolfssl.com>
Date: Tue, 13 Oct 2020 16:21:27 +0200
Subject: [PATCH] check null

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

diff --git a/src/ssl.c b/src/ssl.c
index b9ac91001..e309c292a 100644
--- a/src/ssl.c
+++ b/src/ssl.c
@@ -42037,6 +42037,10 @@ err:
         int ret;
 
         WOLFSSL_ENTER("wolfSSL_CTX_use_certificate");
+        if (!ctx || !x || !x->derCert) {
+            WOLFSSL_MSG("Bad parameter");
+            return WOLFSSL_FAILURE;
+        }
 
         FreeDer(&ctx->certificate); /* Make sure previous is free'd */
         ret = AllocDer(&ctx->certificate, x->derCert->length, CERT_TYPE,