From 1e2bc78fd0c073f6d1a5e7f9351f10f551c9c3cf Mon Sep 17 00:00:00 2001
From: philsmd <philsmd@hashcat.net>
Date: Sat, 13 Jun 2020 11:06:05 +0200
Subject: [PATCH] rule engine: add zero-length check for rule 'z'

---
 OpenCL/inc_rp.cl | 1 +
 1 file changed, 1 insertion(+)

diff --git a/OpenCL/inc_rp.cl b/OpenCL/inc_rp.cl
index 2e4d43a85..56dc6f5de 100644
--- a/OpenCL/inc_rp.cl
+++ b/OpenCL/inc_rp.cl
@@ -518,6 +518,7 @@ DECLSPEC int mangle_dupechar_first (MAYBE_UNUSED const u8 p0, MAYBE_UNUSED const
 {
   const int out_len = len + p0;
 
+  if (len     ==                0) return (len);
   if (out_len >= RP_PASSWORD_SIZE) return (len);
 
   const u8 c = buf[0];