Fix incorrect first matching character when a backreference with zero minimum repeat starts a pattern

pcre-8.41-Fix-wrong-first-character-when-a-backreference-with-.patch

@@ -0,0 +1,74 @@
+From 774be03b760cb4b56abf686f6dc56ac4de07fa67 Mon Sep 17 00:00:00 2001
+From: ph10 <ph10@2f5784b3-3f2a-0410-8824-cb99058d5e15>
+Date: Tue, 12 Dec 2017 15:07:18 +0000
+Subject: [PATCH] Fix wrong first character when a backreference with a zero
+ repeat is first (apart from assersions) in a pattern.
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+git-svn-id: svn://vcs.exim.org/pcre/code/trunk@1719 2f5784b3-3f2a-0410-8824-cb99058d5e15
+Petr Písař: Ported to 8.41.
+---
+ pcre_compile.c       |  2 +-
+ testdata/testinput2  |  8 ++++++++
+ testdata/testoutput2 | 16 ++++++++++++++++
+
+diff --git a/pcre_compile.c b/pcre_compile.c
+index 42f204c..6dd8886 100644
+--- a/pcre_compile.c
++++ b/pcre_compile.c
+@@ -8060,7 +8060,7 @@ for (;; ptr++)
+         single group (i.e. not to a duplicated name. */
+ 
+         HANDLE_REFERENCE:
+-        if (firstcharflags == REQ_UNSET) firstcharflags = REQ_NONE;
++        if (firstcharflags == REQ_UNSET) zerofirstcharflags = firstcharflags = REQ_NONE;
+         previous = code;
+         item_hwm_offset = cd->hwm - cd->start_workspace;
+         *code++ = ((options & PCRE_CASELESS) != 0)? OP_REFI : OP_REF;
+diff --git a/testdata/testinput2 b/testdata/testinput2
+index 08c6f39..8ba4dc4 100644
+--- a/testdata/testinput2
++++ b/testdata/testinput2
+@@ -4249,4 +4249,12 @@ backtracking verbs. --/
+ 
+ /(?=.*[A-Z])/I
+ 
++"(?<=(a))\1?b"
++    ab
++    aaab 
++
++"(?=(a))\1?b"
++    ab
++    aaab 
++
+ /-- End of testinput2 --/
+diff --git a/testdata/testoutput2 b/testdata/testoutput2
+index 811bbef..61ed8d9 100644
+--- a/testdata/testoutput2
++++ b/testdata/testoutput2
+@@ -14705,4 +14705,20 @@ No options
+ No first char
+ No need char
+ 
++"(?<=(a))\1?b"
++    ab
++ 0: b
++ 1: a
++    aaab 
++ 0: ab
++ 1: a
++
++"(?=(a))\1?b"
++    ab
++ 0: ab
++ 1: a
++    aaab 
++ 0: ab
++ 1: a
++
+ /-- End of testinput2 --/
+-- 
+2.13.6
+

pcre.spec

@@ -44,6 +44,9 @@ Patch4:     pcre-8.41-Fix-possible-memory-leak-introduced-in-previous-bug-.patch
 # Allow pcregrep match counter to handle values larger than 2147483647,
 # upstream bug #2208, in upstream after 8.41
 Patch5:     pcre-8.41-Change-pcregrep-linenumbers-and-counts-to-long-ints.patch
+# Fix incorrect first matching character when a backreference with zero minimum
+# repeat starts a pattern, upstream bug #2209, in upstream after 8.41
+Patch6:     pcre-8.41-Fix-wrong-first-character-when-a-backreference-with-.patch
 BuildRequires:  readline-devel
 BuildRequires:  autoconf
 BuildRequires:  automake
@@ -131,6 +134,7 @@ Utilities demonstrating PCRE capabilities like pcregrep or pcretest.
 %patch3 -p1
 %patch4 -p1
 %patch5 -p1
+%patch6 -p1
 # Because of rpath patch
 libtoolize --copy --force
 autoreconf -vif
@@ -235,6 +239,8 @@ make %{?_smp_mflags} check VERBOSE=yes
 * Fri Jan 12 2018 Petr Pisar <ppisar@redhat.com> - 8.41-4
 - Allow pcregrep match counter to handle values larger than 2147483647
   (upstream bug #2208)
+- Fix incorrect first matching character when a backreference with zero minimum
+  repeat starts a pattern (upstream bug #2209)
 
 * Thu Nov 02 2017 Petr Pisar <ppisar@redhat.com> - 8.41-3
 - Accept files names longer than 128 bytes in recursive mode of pcregrep