From a76b68ea7c48a250787de6cdfae1d68d02c295a3 Mon Sep 17 00:00:00 2001
From: valdaarhun <icegambit91@gmail.com>
Date: Mon, 25 Jul 2022 18:49:19 +0530
Subject: [PATCH] Fixes segfault occurrence in PEM_write()

Checks if header is NULL or not before calling strlen().

CLA: trivial

Fixes #18825

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Ben Kaduk <kaduk@mit.edu>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/18865)