!33 regex: fix dead loop in parse_repeat()

From: @xu_huijie
Reviewed-by: @wangbin224
Signed-off-by: @wangbin224

boost.spec

@@ -22,7 +22,7 @@
 
 Name:           boost
 Version:        1.73.0
-Release:        3
+Release:        4
 Summary:        The free peer-reviewed portable C++ source libraries
 License:        Boost Software License V1.0
 URL:            http://www.boost.org
@@ -44,6 +44,8 @@ Patch3:        boost-1.58.0-pool-test_linking.patch
 # https://bugzilla.redhat.com/show_bug.cgi?id=1318383
 Patch4:        boost-1.66.0-no-rpath.patch
 
+Patch9000:     regex-fix-dead-loop-in-parse_repeat.patch
+
 Requires:       %{name}-atomic%{?_isa} = %{version}-%{release}
 Requires:       %{name}-chrono%{?_isa} = %{version}-%{release}
 Requires:       %{name}-container%{?_isa} = %{version}-%{release}
@@ -590,6 +592,7 @@ find ./boost -name '*.hpp' -perm /111 | xargs chmod a-x
 %patch2 -p0
 %patch3 -p1
 %patch4 -p1
+%patch9000 -p1
 
 %build
 %if %{with python3}
@@ -1136,6 +1139,12 @@ fi
 %{_mandir}/man1/bjam.1*
 
 %changelog
+* Tue Jun 22 2021 Xu Huijie <xuhuijie2@huawei.com> - 1.73.0-4
+- Type:bugfix
+- ID:NA
+- SUG:NA
+- DESC:fix dead loop in parse_repeat()
+
 * Wed Dec 16 2020 xinghe <xinghe1@huawei.com> - 1.73.0-3
 - correct license
 

regex-fix-dead-loop-in-parse_repeat.patch

@@ -0,0 +1,33 @@
+From 91107fe78a290a7d25a042fec09ea89f14f480d9 Mon Sep 17 00:00:00 2001
+From: xuhuijie <xuhuijie2@huawei.com>
+Date: Wed, 16 Jun 2021 15:47:22 +0800
+Subject: [PATCH] regex: fix dead loop in parse_repea 
+ There is a bug in parse_repeat(), after deal with comment the
+ contin value will be always true. So we enter a dead loop. To deal with this,
+ we assign contin to false each time we enter the loop.
+ Testcase: boost::regex(std::string("1?+(?#)1"))
+
+Signed-off-by: Xu Huijie <xuhuijie2@huawei.com>
+---
+ boost/regex/v4/basic_regex_parser.hpp | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/boost/regex/v4/basic_regex_parser.hpp b/boost/regex/v4/basic_regex_parser.hpp
+index 6c7065f05..de22f7000 100644
+--- a/boost/regex/v4/basic_regex_parser.hpp
++++ b/boost/regex/v4/basic_regex_parser.hpp
+@@ -1080,9 +1080,10 @@ bool basic_regex_parser<charT, traits>::parse_repeat(std::size_t low, std::size_
+          // Check for illegal following quantifier, we have to do this here, because
+          // the extra states we insert below circumvents our usual error checking :-(
+          //
+-         bool contin = false;
++         bool contin;
+          do
+          {
++            contin = false;
+             if ((this->flags() & (regbase::main_option_type | regbase::mod_x | regbase::no_perl_ex)) == regbase::mod_x)
+             {
+                // whitespace skip:
+-- 
+2.23.0
+