Capped the status code that may be returned with "return" and "try_files".

src/http/modules/ngx_http_rewrite_module.c

diff --git a/src/http/modules/ngx_http_rewrite_module.c b/src/http/modules/ngx_http_rewrite_module.c
index 74d26e5..4081f87 100644
--- a/src/http/modules/ngx_http_rewrite_module.c
+++ b/src/http/modules/ngx_http_rewrite_module.c
@@ -485,6 +485,12 @@
 
     } else {
 
+        if (ret->status > 999) {
+            ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
+                               "invalid return code \"%V\"", &value[1]);
+            return NGX_CONF_ERROR;
+        }
+
         if (cf->args->nelts == 2) {
             return NGX_CONF_OK;
         }

src/http/ngx_http_core_module.c

diff --git a/src/http/ngx_http_core_module.c b/src/http/ngx_http_core_module.c
index 31832ce..5bb01d9 100644
--- a/src/http/ngx_http_core_module.c
+++ b/src/http/ngx_http_core_module.c
@@ -4662,7 +4662,7 @@
 
         code = ngx_atoi(tf[i - 1].name.data + 1, tf[i - 1].name.len - 2);
 
-        if (code == NGX_ERROR) {
+        if (code == NGX_ERROR || code > 999) {
             ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                                "invalid code \"%*s\"",
                                tf[i - 1].name.len - 1, tf[i - 1].name.data);