libxml2: patch CVE-2025-32414

Pick commit which has been backported to 2.12 release branch.

(From OE-Core rev: 187052ce4ddd43b46b8335cc955a63ca19ee6994)

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

2 files changed, 75 insertions, 0 deletions

diff --git a/meta/recipes-core/libxml/libxml2/CVE-2025-32414.patch b/meta/recipes-core/libxml/libxml2/CVE-2025-32414.patch
new file mode 100644
index 0000000000..97bf75f059
--- /dev/null
+++ b/meta/recipes-core/libxml/libxml2/CVE-2025-32414.patch
@@ -0,0 +1,74 @@
+From d7657811964eac1cb9743bb98649278ad948f0d2 Mon Sep 17 00:00:00 2001
+From: Maks Verver <maks@verver.ch>
+Date: Tue, 8 Apr 2025 13:13:55 +0200
+Subject: [PATCH] [CVE-2025-32414] python: Read at most len/4 characters.
+
+Fixes #889 by reserving space in the buffer for UTF-8 encoding of text.
+
+CVE: CVE-2025-32414
+Upstream-Status: Backport [https://gitlab.gnome.org/GNOME/libxml2/-/commit/d7657811964eac1cb9743bb98649278ad948f0d2]
+Signed-off-by: Peter Marko <peter.marko@siemens.com>
+---
+ python/libxml.c | 28 ++++++++++++++++++----------
+ 1 file changed, 18 insertions(+), 10 deletions(-)
+
+diff --git a/python/libxml.c b/python/libxml.c
+index 1fe8d685..2bf14078 100644
+--- a/python/libxml.c
++++ b/python/libxml.c
+@@ -248,7 +248,9 @@ xmlPythonFileReadRaw (void * context, char * buffer, int len) {
+ 
+     file = (PyObject *) context;
+     if (file == NULL) return(-1);
+-    ret = PyObject_CallMethod(file, (char *) "read", (char *) "(i)", len);
++    /* When read() returns a string, the length is in characters not bytes, so
++       request at most len / 4 characters to leave space for UTF-8 encoding. */
++    ret = PyObject_CallMethod(file, (char *) "read", (char *) "(i)", len / 4);
+     if (ret == NULL) {
+        printf("xmlPythonFileReadRaw: result is NULL\n");
+        return(-1);
+@@ -283,10 +285,12 @@ xmlPythonFileReadRaw (void * context, char * buffer, int len) {
+        Py_DECREF(ret);
+        return(-1);
+     }
+-    if (lenread > len)
+-       memcpy(buffer, data, len);
+-    else
+-       memcpy(buffer, data, lenread);
++    if (lenread < 0 || lenread > len) {
++       printf("xmlPythonFileReadRaw: invalid lenread\n");
++       Py_DECREF(ret);
++       return(-1);
++    }
++    memcpy(buffer, data, lenread);
+     Py_DECREF(ret);
+     return(lenread);
+ }
+@@ -310,7 +314,9 @@ xmlPythonFileRead (void * context, char * buffer, int len) {
+ 
+     file = (PyObject *) context;
+     if (file == NULL) return(-1);
+-    ret = PyObject_CallMethod(file, (char *) "io_read", (char *) "(i)", len);
++    /* When io_read() returns a string, the length is in characters not bytes, so
++       request at most len / 4 characters to leave space for UTF-8 encoding. */
++    ret = PyObject_CallMethod(file, (char *) "io_read", (char *) "(i)", len / 4);
+     if (ret == NULL) {
+        printf("xmlPythonFileRead: result is NULL\n");
+        return(-1);
+@@ -345,10 +351,12 @@ xmlPythonFileRead (void * context, char * buffer, int len) {
+        Py_DECREF(ret);
+        return(-1);
+     }
+-    if (lenread > len)
+-       memcpy(buffer, data, len);
+-    else
+-       memcpy(buffer, data, lenread);
++    if (lenread < 0 || lenread > len) {
++       printf("xmlPythonFileRead: invalid lenread\n");
++       Py_DECREF(ret);
++       return(-1);
++    }
++    memcpy(buffer, data, lenread);
+     Py_DECREF(ret);
+     return(lenread);
+ }
diff --git a/meta/recipes-core/libxml/libxml2_2.12.10.bb b/meta/recipes-core/libxml/libxml2_2.12.10.bb
index c4f76c281d..42672e35bd 100644
--- a/meta/recipes-core/libxml/libxml2_2.12.10.bb
+++ b/meta/recipes-core/libxml/libxml2_2.12.10.bb
@@ -18,6 +18,7 @@ inherit gnomebase
 SRC_URI += "http://www.w3.org/XML/Test/xmlts20130923.tar;subdir=${BP};name=testtar \
            file://run-ptest \
            file://install-tests.patch \
+           file://CVE-2025-32414.patch \
            "
 
 SRC_URI[archive.sha256sum] = "c3d8c0c34aa39098f66576fe51969db12a5100b956233dc56506f7a8679be995"