libxml2: patch CVE-2023-28484 and CVE-2023-29469

Backports from:
* https://gitlab.gnome.org/GNOME/libxml2/-/commit/e4f85f1bd2eb34d9b49da9154a4cc3a1bc284f68
* https://gitlab.gnome.org/GNOME/libxml2/-/commit/547edbf1cbdccd46b2e8ff322a456eaa5931c5df

(From OE-Core rev: c0cfcd3945257efd40745e0ebb84495441acb590)

Signed-off-by: Peter Marko <peter.marko@siemens.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>

meta/recipes-core/libxml/libxml2/CVE-2023-28484.patch

@@ -0,0 +1,79 @@
+From e4f85f1bd2eb34d9b49da9154a4cc3a1bc284f68 Mon Sep 17 00:00:00 2001
+From: Nick Wellnhofer <wellnhofer@aevum.de>
+Date: Fri, 7 Apr 2023 11:46:35 +0200
+Subject: [PATCH] [CVE-2023-28484] Fix null deref in xmlSchemaFixupComplexType
+
+Fix a null pointer dereference when parsing (invalid) XML schemas.
+
+Thanks to Robby Simpson for the report!
+
+Fixes #491.
+
+CVE: CVE-2023-28484
+Upstream-Status: Backport [https://gitlab.gnome.org/GNOME/libxml2/-/commit/e4f85f1bd2eb34d9b49da9154a4cc3a1bc284f68]
+
+Signed-off-by: Peter Marko <peter.marko@siemens.com>
+---
+ result/schemas/issue491_0_0.err |  1 +
+ test/schemas/issue491_0.xml     |  1 +
+ test/schemas/issue491_0.xsd     | 18 ++++++++++++++++++
+ xmlschemas.c                    |  2 +-
+ 4 files changed, 21 insertions(+), 1 deletion(-)
+ create mode 100644 result/schemas/issue491_0_0.err
+ create mode 100644 test/schemas/issue491_0.xml
+ create mode 100644 test/schemas/issue491_0.xsd
+
+diff --git a/result/schemas/issue491_0_0.err b/result/schemas/issue491_0_0.err
+new file mode 100644
+index 00000000..9b2bb969
+--- /dev/null
++++ b/result/schemas/issue491_0_0.err
+@@ -0,0 +1 @@
++./test/schemas/issue491_0.xsd:8: element complexType: Schemas parser error : complex type 'ChildType': The content type of both, the type and its base type, must either 'mixed' or 'element-only'.
+diff --git a/test/schemas/issue491_0.xml b/test/schemas/issue491_0.xml
+new file mode 100644
+index 00000000..e2b2fc2e
+--- /dev/null
++++ b/test/schemas/issue491_0.xml
+@@ -0,0 +1 @@
++<Child xmlns="http://www.test.com">5</Child>
+diff --git a/test/schemas/issue491_0.xsd b/test/schemas/issue491_0.xsd
+new file mode 100644
+index 00000000..81702649
+--- /dev/null
++++ b/test/schemas/issue491_0.xsd
+@@ -0,0 +1,18 @@
++<?xml version='1.0' encoding='UTF-8'?>
++<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns="http://www.test.com" targetNamespace="http://www.test.com" elementFormDefault="qualified" attributeFormDefault="unqualified">
++  <xs:complexType name="BaseType">
++    <xs:simpleContent>
++      <xs:extension base="xs:int" />
++    </xs:simpleContent>
++  </xs:complexType>
++  <xs:complexType name="ChildType">
++    <xs:complexContent>
++      <xs:extension base="BaseType">
++        <xs:sequence>
++          <xs:element name="bad" type="xs:int" minOccurs="0" maxOccurs="1"/>
++        </xs:sequence>
++      </xs:extension>
++    </xs:complexContent>
++  </xs:complexType>
++  <xs:element name="Child" type="ChildType" />
++</xs:schema>
+diff --git a/xmlschemas.c b/xmlschemas.c
+index 6a353858..a4eaf591 100644
+--- a/xmlschemas.c
++++ b/xmlschemas.c
+@@ -18632,7 +18632,7 @@ xmlSchemaFixupComplexType(xmlSchemaParserCtxtPtr pctxt,
+ 			"allowed to appear inside other model groups",
+ 			NULL, NULL);
+ 
+-		} else if (! dummySequence) {
++		} else if ((!dummySequence) && (baseType->subtypes != NULL)) {
+ 		    xmlSchemaTreeItemPtr effectiveContent =
+ 			(xmlSchemaTreeItemPtr) type->subtypes;
+ 		    /*
+-- 
+GitLab
+

meta/recipes-core/libxml/libxml2/CVE-2023-29469.patch

@@ -0,0 +1,42 @@
+From 547edbf1cbdccd46b2e8ff322a456eaa5931c5df Mon Sep 17 00:00:00 2001
+From: Nick Wellnhofer <wellnhofer@aevum.de>
+Date: Fri, 7 Apr 2023 11:49:27 +0200
+Subject: [PATCH] [CVE-2023-29469] Hashing of empty dict strings isn't
+ deterministic
+
+When hashing empty strings which aren't null-terminated,
+xmlDictComputeFastKey could produce inconsistent results. This could
+lead to various logic or memory errors, including double frees.
+
+For consistency the seed is also taken into account, but this shouldn't
+have an impact on security.
+
+Found by OSS-Fuzz.
+
+Fixes #510.
+
+CVE: CVE-2023-29469
+Upstream-Status: Backport [https://gitlab.gnome.org/GNOME/libxml2/-/commit/547edbf1cbdccd46b2e8ff322a456eaa5931c5df]
+
+Signed-off-by: Peter Marko <peter.marko@siemens.com>
+---
+ dict.c | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/dict.c b/dict.c
+index 86c3f6d7..d7fd1a06 100644
+--- a/dict.c
++++ b/dict.c
+@@ -451,7 +451,8 @@ static unsigned long
+ xmlDictComputeFastKey(const xmlChar *name, int namelen, int seed) {
+     unsigned long value = seed;
+ 
+-    if (name == NULL) return(0);
++    if ((name == NULL) || (namelen <= 0))
++        return(value);
+     value = *name;
+     value <<= 5;
+     if (namelen > 10) {
+-- 
+GitLab
+

meta/recipes-core/libxml/libxml2_2.9.10.bb

@@ -36,6 +36,8 @@ SRC_URI += "http://www.w3.org/XML/Test/xmlts20080827.tar.gz;subdir=${BP};name=te
            file://CVE-2016-3709.patch \
            file://CVE-2022-40303.patch \
            file://CVE-2022-40304.patch \
+           file://CVE-2023-28484.patch \
+           file://CVE-2023-29469.patch \
            "
 
 SRC_URI[archive.sha256sum] = "593b7b751dd18c2d6abcd0c4bcb29efc203d0b4373a6df98e3a455ea74ae2813"