# HG changeset patch
# User Maxim Dounin <mdounin@mdounin.ru>
# Date 1441980280 -10800
# Node ID 3cf25d33886a8f025c98ffc4bd37a28c7cfd904a
# Parent  055d1f63960aa8d0a1843ab75b7156fe61c7295f
Core: fixed segfault with null in wildcard hash names.

A configuration like

    server { server_name .foo^@; }
    server { server_name .foo; }

resulted in a segmentation fault during construction of server names hash.

Reported by Markus Linnala.
Found with afl-fuzz.

diff --git a/src/core/ngx_hash.c b/src/core/ngx_hash.c
--- a/src/core/ngx_hash.c
+++ b/src/core/ngx_hash.c
@@ -743,6 +743,10 @@ ngx_hash_add_key(ngx_hash_keys_arrays_t 
             if (key->data[i] == '.' && key->data[i + 1] == '.') {
                 return NGX_DECLINED;
             }
+
+            if (key->data[i] == '\0') {
+                return NGX_DECLINED;
+            }
         }
 
         if (key->len > 1 && key->data[0] == '.') {