# HG changeset patch
# User Roman Arutyunyan <arut@nginx.com>
# Date 1442866114 -10800
# Node ID fbbb1c1ce1ebe7f748df53817afb06cc289c8ba5
# Parent  257b51c37c5a76559d50c2a44011a7d3f45bd4b9
Sub filter: fixed initialization in http{} level (ticket #791).

If sub_filter directive was only specified at http{} level, sub filter
internal data remained uninitialized.  That would lead to a crash in runtime.

diff --git a/src/http/modules/ngx_http_sub_filter_module.c b/src/http/modules/ngx_http_sub_filter_module.c
--- a/src/http/modules/ngx_http_sub_filter_module.c
+++ b/src/http/modules/ngx_http_sub_filter_module.c
@@ -853,8 +853,9 @@ ngx_http_sub_merge_conf(ngx_conf_t *cf, 
         conf->pairs = prev->pairs;
         conf->matches = prev->matches;
         conf->tables = prev->tables;
+    }
 
-    } else if (conf->dynamic == 0){
+    if (conf->pairs && conf->dynamic == 0 && conf->tables == NULL) {
         pairs = conf->pairs->elts;
         n = conf->pairs->nelts;