create empty radix tree for "geo $geo { }" case

diff --git a/src/http/modules/ngx_http_geo_module.c b/src/http/modules/ngx_http_geo_module.c
index 5fc63210c1c1d7023f5babe1854b6a64784d59cf..bba399f6c094e5901ba2fac14a18d7465aee3369 100644 (file)
--- a/src/http/modules/ngx_http_geo_module.c
+++ b/src/http/modules/ngx_http_geo_module.c
@@ -255,6 +255,13 @@ ngx_http_geo_block(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
         }
 
     } else {
+        if (ctx.tree == NULL) {
+            ctx.tree = ngx_radix_tree_create(cf->pool, -1);
+            if (ctx.tree == NULL) {
+                return NGX_CONF_ERROR;
+            }
+        }
+
         var->get_handler = ngx_http_geo_cidr_variable;
         var->data = (uintptr_t) ctx.tree;