From 94a9b5066827d7dc5b1844ae28fad79778314185 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Peter=20Z=C3=BCger?= <zueger.peter@icloud.com>
Date: Wed, 16 Mar 2022 16:41:23 +0100
Subject: [PATCH] mimxrt/mbedtls: Add NULL pointer check in m_free_mbedtls.
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Signed-off-by: Peter Züger <zueger.peter@icloud.com>
---
 ports/mimxrt/mbedtls/mbedtls_port.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/ports/mimxrt/mbedtls/mbedtls_port.c b/ports/mimxrt/mbedtls/mbedtls_port.c
index eb11f5141b..928f12f3f1 100644
--- a/ports/mimxrt/mbedtls/mbedtls_port.c
+++ b/ports/mimxrt/mbedtls/mbedtls_port.c
@@ -64,6 +64,9 @@ void *m_calloc_mbedtls(size_t nmemb, size_t size) {
 }
 
 void m_free_mbedtls(void *ptr_in) {
+    if (ptr_in == NULL) {
+        return;
+    }
     void **ptr = &((void **)ptr_in)[-2];
     #if DEBUG
     uint32_t nb;