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libxml2: fix CVE-2025-49795

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A NULL pointer dereference vulnerability was found in libxml2 when
processing XPath XML expressions. This flaw allows an attacker to
craft a malicious XML input to libxml2, leading to a denial of service.

Pick commit from 2.13 branch

Reference:
https://security-tracker.debian.org/tracker/CVE-2025-49795

Upstream-patch:
62048278a4

(From OE-Core rev: 9f17e0911eeb49e007de8ee3e50d9f3f38e08a26)

Signed-off-by: Divya Chellam <divya.chellam@windriver.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>
This commit is contained in:
Divya Chellam
2025-07-16 16:48:49 +05:30
committed by Steve Sakoman
parent 4a37001c6a
commit e63738d6b1
2 changed files with 76 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

75
meta/recipes-core/libxml/libxml2/CVE-2025-49795.patch Normal file
View File

@@ -0,0 +1,75 @@
From 62048278a4c5fdf14d287dfb400005c0a0caa69f Mon Sep 17 00:00:00 2001
From: Michael Mann <mmann78@netscape.net>
Date: Sat, 21 Jun 2025 12:11:30 -0400
Subject: [PATCH] [CVE-2025-49795] schematron: Fix null pointer dereference
leading to DoS
Fixes #932
CVE: CVE-2025-49795
Upstream-Status: Backport [https://gitlab.gnome.org/GNOME/libxml2/-/commit/62048278a4c5fdf14d287dfb400005c0a0caa69f]
Signed-off-by: Divya Chellam <divya.chellam@windriver.com>
---
result/schematron/zvon16_0.err | 3 +++
schematron.c | 5 +++++
test/schematron/zvon16.sct | 7 +++++++
test/schematron/zvon16_0.xml | 5 +++++
4 files changed, 20 insertions(+)
create mode 100644 result/schematron/zvon16_0.err
create mode 100644 test/schematron/zvon16.sct
create mode 100644 test/schematron/zvon16_0.xml
diff --git a/result/schematron/zvon16_0.err b/result/schematron/zvon16_0.err
new file mode 100644
index 0000000..3d05240
--- /dev/null
+++ b/result/schematron/zvon16_0.err
@@ -0,0 +1,3 @@
+XPath error : Unregistered function
+./test/schematron/zvon16_0.xml:2: element book: schematron error : /library/book line 2: Book
+./test/schematron/zvon16_0.xml fails to validate
diff --git a/schematron.c b/schematron.c
index 426300c..6e2ceeb 100644
--- a/schematron.c
+++ b/schematron.c
@@ -1509,6 +1509,11 @@ xmlSchematronFormatReport(xmlSchematronValidCtxtPtr ctxt,
select = xmlGetNoNsProp(child, BAD_CAST "select");
comp = xmlXPathCtxtCompile(ctxt->xctxt, select);
eval = xmlXPathCompiledEval(comp, ctxt->xctxt);
+ if (eval == NULL) {
+ xmlXPathFreeCompExpr(comp);
+ xmlFree(select);
+ return ret;
+ }
switch (eval->type) {
case XPATH_NODESET: {
diff --git a/test/schematron/zvon16.sct b/test/schematron/zvon16.sct
new file mode 100644
index 0000000..f03848a
--- /dev/null
+++ b/test/schematron/zvon16.sct
@@ -0,0 +1,7 @@
+<sch:schema xmlns:sch="http://purl.oclc.org/dsdl/schematron">
+ <sch:pattern id="TestPattern">
+ <sch:rule context="book">
+ <sch:report test="not(@available)">Book <sch:value-of select="falae()"/> test</sch:report>
+ </sch:rule>
+ </sch:pattern>
+</sch:schema>
diff --git a/test/schematron/zvon16_0.xml b/test/schematron/zvon16_0.xml
new file mode 100644
index 0000000..551e2d6
--- /dev/null
+++ b/test/schematron/zvon16_0.xml
@@ -0,0 +1,5 @@
+<library>
+ <book title="Test Book" id="bk101">
+ <author>Test Author</author>
+ </book>
+</library>
--
2.40.0

1
meta/recipes-core/libxml/libxml2_2.13.8.bb
View File

@@ -19,6 +19,7 @@ SRC_URI += "http://www.w3.org/XML/Test/xmlts20130923.tar;subdir=${BP};name=testt
file://install-tests.patch \
file://CVE-2025-6021.patch \
file://CVE-2025-49794_CVE-2025-49796.patch \
file://CVE-2025-49795.patch \
"
SRC_URI[archive.sha256sum] = "277294cb33119ab71b2bc81f2f445e9bc9435b893ad15bb2cd2b0e859a0ee84a"