!56 add amended patch for cve-2022-2309

From: @renxichen 
Reviewed-by: @xiezhipeng1, @gaoruoshu 
Signed-off-by: @xiezhipeng1

backport-Work-around-libxml2-bug-in-affected-versions.patch

@@ -0,0 +1,56 @@
+From c742576c105f40fc8b754fcae56fee4aa35840a3 Mon Sep 17 00:00:00 2001
+From: Stefan Behnel <stefan_ml@behnel.de>
+Date: Tue, 19 Jul 2022 08:25:20 +0200
+Subject: [PATCH] Work around libxml2 bug in affected versions that failed to
+ reset the namespace count in the parser context.
+
+See https://gitlab.gnome.org/GNOME/libxml2/-/issues/378
+---
+ src/lxml/includes/xmlparser.pxd | 1 +
+ src/lxml/parser.pxi             | 3 +++
+ src/lxml/tests/test_etree.py    | 3 +--
+ 3 files changed, 5 insertions(+), 2 deletions(-)
+
+diff --git a/src/lxml/includes/xmlparser.pxd b/src/lxml/includes/xmlparser.pxd
+index a196e34..45acfc8 100644
+--- a/src/lxml/includes/xmlparser.pxd
++++ b/src/lxml/includes/xmlparser.pxd
+@@ -144,6 +144,7 @@ cdef extern from "libxml/parser.h":
+         void* userData
+         int* spaceTab
+         int spaceMax
++        int nsNr
+         bint html
+         bint progressive
+         int inSubset
+diff --git a/src/lxml/parser.pxi b/src/lxml/parser.pxi
+index f5baf29..f0c8c6b 100644
+--- a/src/lxml/parser.pxi
++++ b/src/lxml/parser.pxi
+@@ -569,6 +569,9 @@ cdef class _ParserContext(_ResolverContext):
+                 self._c_ctxt.disableSAX = 0 # work around bug in libxml2
+             else:
+                 xmlparser.xmlClearParserCtxt(self._c_ctxt)
++                # work around bug in libxml2 [2.9.10 .. 2.9.14]:
++                # https://gitlab.gnome.org/GNOME/libxml2/-/issues/378
++                self._c_ctxt.nsNr = 0
+ 
+     cdef int prepare(self, bint set_document_loader=True) except -1:
+         cdef int result
+diff --git a/src/lxml/tests/test_etree.py b/src/lxml/tests/test_etree.py
+index 8bf82c0..0339796 100644
+--- a/src/lxml/tests/test_etree.py
++++ b/src/lxml/tests/test_etree.py
+@@ -1491,8 +1491,7 @@ class ETreeOnlyTestCase(HelperTestCase):
+             # This would be the expected result, because there was no namespace
+             pass
+         else:
+-            # This is a bug in libxml2
+-            assert not ns, repr(ns)
++            assert False, "Found unexpected namespace '%s'" % ns
+ 
+     def test_itertext_comment_pi(self):
+         # https://bugs.launchpad.net/lxml/+bug/1844674
+-- 
+1.8.3.1
+

python-lxml.spec

@@ -7,12 +7,14 @@ The latest release works with all CPython versions from 2.7 to 3.7.
 
 Name:           python-%{modname}
 Version:        4.9.1
-Release:        2
+Release:        3
 Summary:        XML processing library combining libxml2/libxslt with the ElementTree API
 License:        BSD
 URL:            https://github.com/lxml/lxml
 Source0:        %_sourcedir/lxml-%{version}.tar.gz
 
+Patch6000:      backport-Work-around-libxml2-bug-in-affected-versions.patch
+
 BuildRequires:  gcc libxml2-devel libxslt-devel
 
 %description %{_description}
@@ -51,7 +53,10 @@ make test3
 %files help
 %doc README.rst src/lxml/isoschematron/resources/xsl/iso-schematron-xslt1/readme.txt
 
-%changelog 
+%changelog
+* Fri Jul 29 2022 renhongxun <renhongxun@h-partners.com> - 4.9.1-3
+- add amended patch for cve-2022-2309
+
 * Mon Jul 25 2022 shixuantong <shixuantong@h-partners.com> - 4.9.1-2
 - Remove pregenerated Cython C sources