From 4bb907522b35bf005691f32792c1a03714cf3871 Mon Sep 17 00:00:00 2001
From: Kareem <kareem@wolfssl.com>
Date: Fri, 21 Jul 2023 11:08:15 -0700
Subject: [PATCH] Fix wolfSSL_SMIME_write_PKCS7 not removing NULL characters
 between sections.

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

diff --git a/src/ssl.c b/src/ssl.c
index 8b655b7d8..a85f4d977 100644
--- a/src/ssl.c
+++ b/src/ssl.c
@@ -36134,7 +36134,7 @@ static int wolfSSL_BIO_to_MIME_crlf(WOLFSSL_BIO* in, WOLFSSL_BIO* out)
             }
 
             /* remove trailing null */
-            if (canonLine[canonLineLen] == '\0') {
+            if (canonLineLen >= 1 && canonLine[canonLineLen-1] == '\0') {
                 canonLineLen--;
             }