From 4fcfb9d5fb2b1bfbb3bd87a8617d293cbf2f4ddf Mon Sep 17 00:00:00 2001
From: Zhidao HONG <z.hong@f5.com>
Date: Mon, 14 Feb 2022 20:14:03 +0800
Subject: [PATCH] Certificates: fixed crash when reallocating chain.

---
 docs/changes.xml | 7 +++++++
 src/nxt_cert.c   | 1 -
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/docs/changes.xml b/docs/changes.xml
index a6b1178d..3ef1ac3f 100644
--- a/docs/changes.xml
+++ b/docs/changes.xml
@@ -31,6 +31,13 @@ NGINX Unit updated to 1.27.0.
          date="" time=""
          packager="Andrei Belov &lt;defan@nginx.com&gt;">
 
+<change type="bugfix">
+<para>
+the controller process could crash when a chain with more than 4
+certificates was uploaded.
+</para>
+</change>
+
 <change type="bugfix">
 <para>
 some Perl applications failed to process the request body, notably with Plack.
diff --git a/src/nxt_cert.c b/src/nxt_cert.c
index 01d413e0..4a1f1496 100644
--- a/src/nxt_cert.c
+++ b/src/nxt_cert.c
@@ -241,7 +241,6 @@ nxt_cert_bio(nxt_task_t *task, BIO *bio)
                     goto fail;
                 }
 
-                nxt_free(cert);
                 cert = new_cert;
             }