bugfix: nginx crash when accessing uninitialized pointer.

.travis.yml

@@ -23,7 +23,7 @@ env:
   matrix:
     - NGINX_VERSION=1.19.3
     - NGINX_VERSION=1.19.9
-    - NGINX_VERSION=1.23.0
+    - NGINX_VERSION=1.23.0 WITHOUT_PCRE2=1
 
 before_install:
   - sudo apt-get update -y

src/ngx_http_headers_more_headers_in.c

@@ -335,6 +335,9 @@ matched:
 
     h->key = hv->key;
     h->value = *value;
+#if defined(nginx_version) && nginx_version >= 1023000
+    h->next = NULL;
+#endif
 
     h->lowcase_key = ngx_pnalloc(r->pool, h->key.len);
     if (h->lowcase_key == NULL) {

util/build.sh

@@ -6,6 +6,10 @@ root=`pwd`
 version=$1
 home=~
 force=$2
+pcre2_opt=""
+if [ "$WITHOUT_PCRE2" = "1" ]; then
+    pcre2_opt="--without-pcre2"
+fi
 
         #--with-cc=gcc46 \
 
@@ -21,6 +25,7 @@ ngx-build $force $version \
         --without-http_autoindex_module \
         --without-http_auth_basic_module \
         --without-http_userid_module \
+        $pcre2_opt \
         --with-http_realip_module \
         --with-http_dav_module \
       --add-module=$root/../eval-nginx-module \