libxml2: patch CVE-2025-32414

Pick commit from 2.12 branch as 2.9 branch is unmaintained now.

(From OE-Core rev: fbd708438aba0381a6c4f3d6cfbbd743f89a4f97)

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..23a2316672
--- /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
+@@ -287,7 +287,9 @@ xmlPythonFileReadRaw (void * context, char * buffer, int len) {
+ #endif
+     file = (PyObject *) context;
+     if (file == NULL) return(-1);
+-    ret = PyEval_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 = PyEval_CallMethod(file, (char *) "read", (char *) "(i)", len / 4);
+     if (ret == NULL) {
+        printf("xmlPythonFileReadRaw: result is NULL\n");
+        return(-1);
+@@ -322,10 +324,12 @@ 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);
+ }
+@@ -352,7 +356,9 @@ xmlPythonFileRead (void * context, char * buffer, int len) {
+ #endif
+     file = (PyObject *) context;
+     if (file == NULL) return(-1);
+-    ret = PyEval_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 = PyEval_CallMethod(file, (char *) "io_read", (char *) "(i)", len / 4);
+     if (ret == NULL) {
+        printf("xmlPythonFileRead: result is NULL\n");
+        return(-1);
+@@ -387,10 +393,12 @@ 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_2.9.14.bb b/meta/recipes-core/libxml/libxml2_2.9.14.bb
index 1cbd620b34..e281a39fd4 100644
--- a/meta/recipes-core/libxml/libxml2_2.9.14.bb
+++ b/meta/recipes-core/libxml/libxml2_2.9.14.bb
@@ -37,6 +37,7 @@ SRC_URI += "http://www.w3.org/XML/Test/xmlts20080827.tar;subdir=${BP};name=testt
            file://CVE-2025-27113.patch \
            file://CVE-2024-56171.patch \
            file://CVE-2025-24928.patch \
+           file://CVE-2025-32414.patch \
            "
 
 SRC_URI[archive.sha256sum] = "60d74a257d1ccec0475e749cba2f21559e48139efba6ff28224357c7c798dfee"