From c82ef7bef66138a85362473df622d16bf728499e Mon Sep 17 00:00:00 2001
From: ph10 <ph10@6239d852-aaf2-0410-a92c-79f79f948069>
Date: Sun, 4 Mar 2018 15:13:37 +0000
Subject: [PATCH] Set error offset zero for early errors in
 pcre2_pattern_convert().
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git-svn-id: svn://vcs.exim.org/pcre2/code/trunk@926 6239d852-aaf2-0410-a92c-79f79f948069
Petr Písař: Ported to 10.31.
---
 src/pcre2_convert.c | 12 +++++++++---

diff --git a/src/pcre2_convert.c b/src/pcre2_convert.c
index bdf9b86..1dd5c33 100644
--- a/src/pcre2_convert.c
+++ b/src/pcre2_convert.c
@@ -7,7 +7,7 @@ and semantics are as close as possible to those of the Perl 5 language.
 
                        Written by Philip Hazel
      Original API code Copyright (c) 1997-2012 University of Cambridge
-          New API code Copyright (c) 2016-2017 University of Cambridge
+          New API code Copyright (c) 2016-2018 University of Cambridge
 
 -----------------------------------------------------------------------------
 Redistribution and use in source and binary forms, with or without
@@ -1066,11 +1066,12 @@ BOOL utf = (options & PCRE2_CONVERT_UTF) != 0;
 uint32_t pattype = options & TYPE_OPTIONS;
 
 if (pattern == NULL || bufflenptr == NULL) return PCRE2_ERROR_NULL;
+
 if ((options & ~ALL_OPTIONS) != 0 ||        /* Undefined bit set */
     (pattype & (~pattype+1)) != pattype ||  /* More than one type set */
     pattype == 0)                           /* No type set */
   {
-  *bufflenptr = 0;  /* Error offset */
+  *bufflenptr = 0;                          /* Error offset */
   return PCRE2_ERROR_BADOPTION;
   }
 
@@ -1081,7 +1082,11 @@ if (ccontext == NULL) ccontext =
 /* Check UTF if required. */
 
 #ifndef SUPPORT_UNICODE
-if (utf) return PCRE2_ERROR_UNICODE_NOT_SUPPORTED;
+if (utf)
+  {
+  *bufflenptr = 0;  /* Error offset */
+  return PCRE2_ERROR_UNICODE_NOT_SUPPORTED;
+  }
 #else
 if (utf && (options & PCRE2_CONVERT_NO_UTF_CHECK) == 0)
   {
@@ -1126,6 +1131,7 @@ for (i = 0; i < 2; i++)
     break;
 
     default:
+    *bufflenptr = 0;  /* Error offset */
     return PCRE2_ERROR_INTERNAL;
     }
 
-- 
2.14.3