python3-lxml: Security fix CVE-2022-2309

CVE-2022-0934:
lxml: NULL Pointer Dereference in lxml

Reference:
https://nvd.nist.gov/vuln/detail/CVE-2022-2309

Patch from:
https://github.com/lxml/lxml/commit/86368e9cf70a0ad23cccd5ee32de847149af0c6f

Signed-off-by: Yue Tao <Yue.Tao@windriver.com>

meta-python/recipes-devtools/python/python3-lxml/CVE-2022-2309.patch

@@ -0,0 +1,99 @@
+From 86368e9cf70a0ad23cccd5ee32de847149af0c6f Mon Sep 17 00:00:00 2001
+From: Stefan Behnel <stefan_ml@behnel.de>
+Date: Fri, 1 Jul 2022 21:06:10 +0200
+Subject: [PATCH] Fix a crash when incorrect parser input occurs together with
+ usages of iterwalk() on trees generated by the same parser.
+
+CVE: CVE-2022-2309
+
+Upstream-Status: Backport
+[https://github.com/lxml/lxml/commit/86368e9cf70a0ad23cccd5ee32de847149af0c6f]
+
+Signed-off-by: Yue Tao <yue.tao@windriver.com>
+
+---
+ src/lxml/apihelpers.pxi      |  7 ++++---
+ src/lxml/iterparse.pxi       | 11 ++++++-----
+ src/lxml/tests/test_etree.py | 20 ++++++++++++++++++++
+ 3 files changed, 30 insertions(+), 8 deletions(-)
+
+diff --git a/src/lxml/apihelpers.pxi b/src/lxml/apihelpers.pxi
+index c1662762..9fae9fb1 100644
+--- a/src/lxml/apihelpers.pxi
++++ b/src/lxml/apihelpers.pxi
+@@ -246,9 +246,10 @@ cdef dict _build_nsmap(xmlNode* c_node):
+     while c_node is not NULL and c_node.type == tree.XML_ELEMENT_NODE:
+         c_ns = c_node.nsDef
+         while c_ns is not NULL:
+-            prefix = funicodeOrNone(c_ns.prefix)
+-            if prefix not in nsmap:
+-                nsmap[prefix] = funicodeOrNone(c_ns.href)
++            if c_ns.prefix or c_ns.href:
++                prefix = funicodeOrNone(c_ns.prefix)
++                if prefix not in nsmap:
++                    nsmap[prefix] = funicodeOrNone(c_ns.href)
+             c_ns = c_ns.next
+         c_node = c_node.parent
+     return nsmap
+diff --git a/src/lxml/iterparse.pxi b/src/lxml/iterparse.pxi
+index 138c23a6..a7299da6 100644
+--- a/src/lxml/iterparse.pxi
++++ b/src/lxml/iterparse.pxi
+@@ -420,7 +420,7 @@ cdef int _countNsDefs(xmlNode* c_node):
+     count = 0
+     c_ns = c_node.nsDef
+     while c_ns is not NULL:
+-        count += 1
++        count += (c_ns.href is not NULL)
+         c_ns = c_ns.next
+     return count
+ 
+@@ -431,9 +431,10 @@ cdef int _appendStartNsEvents(xmlNode* c_node, list event_list) except -1:
+     count = 0
+     c_ns = c_node.nsDef
+     while c_ns is not NULL:
+-        ns_tuple = (funicode(c_ns.prefix) if c_ns.prefix is not NULL else '',
+-                    funicode(c_ns.href))
+-        event_list.append( (u"start-ns", ns_tuple) )
+-        count += 1
++        if c_ns.href:
++            ns_tuple = (funicodeOrEmpty(c_ns.prefix),
++                        funicode(c_ns.href))
++            event_list.append( (u"start-ns", ns_tuple) )
++            count += 1
+         c_ns = c_ns.next
+     return count
+diff --git a/src/lxml/tests/test_etree.py b/src/lxml/tests/test_etree.py
+index e5f08469..285313f6 100644
+--- a/src/lxml/tests/test_etree.py
++++ b/src/lxml/tests/test_etree.py
+@@ -1460,6 +1460,26 @@ class ETreeOnlyTestCase(HelperTestCase):
+             [1,2,1,4],
+             counts)
+ 
++    def test_walk_after_parse_failure(self):
++        # This used to be an issue because libxml2 can leak empty namespaces
++        # between failed parser runs.  iterwalk() failed to handle such a tree.
++        try:
++            etree.XML('''<anot xmlns="1">''')
++        except etree.XMLSyntaxError:
++            pass
++        else:
++            assert False, "invalid input did not fail to parse"
++
++        et = etree.XML('''<root>  </root>''')
++        try:
++            ns = next(etree.iterwalk(et, events=('start-ns',)))
++        except StopIteration:
++            # This would be the expected result, because there was no namespace
++            pass
++        else:
++            # This is a bug in libxml2
++            assert not ns, repr(ns)
++
+     def test_itertext_comment_pi(self):
+         # https://bugs.launchpad.net/lxml/+bug/1844674
+         XML = self.etree.XML
+-- 
+2.17.1
+

meta-python/recipes-devtools/python/python3-lxml_4.8.0.bb

@@ -20,7 +20,8 @@ DEPENDS += "libxml2 libxslt"
 
 SRC_URI[sha256sum] = "f63f62fc60e6228a4ca9abae28228f35e1bd3ce675013d1dfb828688d50c6e23"
 
-SRC_URI += "${PYPI_SRC_URI}"
+SRC_URI += "${PYPI_SRC_URI} \
+            file://CVE-2022-2309.patch "
 inherit pkgconfig pypi setuptools3
 
 # {standard input}: Assembler messages: