From 8dc7206187ef9e9486fb5f102b85400ae9795dd1 Mon Sep 17 00:00:00 2001
From: ph10 <ph10@2f5784b3-3f2a-0410-8824-cb99058d5e15>
Date: Mon, 19 Feb 2018 16:35:05 +0000
Subject: [PATCH] Fix POSIX API bug when REG_STARTEND is used with a non-zero
 starting offset and there are unset groups within the matching group list.
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git-svn-id: svn://vcs.exim.org/pcre/code/trunk@1724 2f5784b3-3f2a-0410-8824-cb99058d5e15
Petr Písař: Ported to 8.41.
---
 pcreposix.c | 6 +++---

diff --git a/pcreposix.c b/pcreposix.c
index 7b404a7..a76d6bf 100644
--- a/pcreposix.c
+++ b/pcreposix.c
@@ -6,7 +6,7 @@
 and semantics are as close as possible to those of the Perl 5 language.
 
                        Written by Philip Hazel
-           Copyright (c) 1997-2017 University of Cambridge
+           Copyright (c) 1997-2018 University of Cambridge
 
 -----------------------------------------------------------------------------
 Redistribution and use in source and binary forms, with or without
@@ -389,8 +389,8 @@ if (rc >= 0)
     {
     for (i = 0; i < (size_t)rc; i++)
       {
-      pmatch[i].rm_so = ovector[i*2] + so;
-      pmatch[i].rm_eo = ovector[i*2+1] + so;
+      pmatch[i].rm_so = (ovector[i*2] < 0)? -1 : ovector[i*2] + so;
+      pmatch[i].rm_eo = (ovector[i*2+1] < 0)? -1: ovector[i*2+1] + so;
       }
     if (allocated_ovector) free(ovector);
     for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
-- 
2.13.6