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gh-132097: fix runtime UB when calling expat handlers #132265

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Apr 12, 2025
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gh-132097: fix runtime UB when calling expat handlers #132265

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35 changes: 21 additions & 14 deletions Modules/_elementtree.c
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Original file line number Original file line Diff line number Diff line change
Expand Up @@ -3082,8 +3082,7 @@ typedef struct {
PyObject *elementtree_module; PyObject *elementtree_module;
} XMLParserObject; } XMLParserObject;



#define XMLParserObject_CAST(op) ((XMLParserObject *)(op))
#define _XMLParser_CAST(op) ((XMLParserObject *)(op))


/* helpers */ /* helpers */


Expand Down Expand Up @@ -3207,9 +3206,9 @@ expat_set_error(elementtreestate *st, enum XML_Error error_code,
/* handlers */ /* handlers */


static void static void
expat_default_handler(XMLParserObject* self, const XML_Char* data_in, expat_default_handler(void *op, const XML_Char *data_in, int data_len)
int data_len)
{ {
XMLParserObject *self = XMLParserObject_CAST(op);
PyObject *key; PyObject *key;
PyObject *value; PyObject *value;
PyObject *res; PyObject *res;
Expand Down Expand Up @@ -3254,9 +3253,10 @@ expat_default_handler(XMLParserObject* self, const XML_Char* data_in,
} }


static void static void
expat_start_handler(XMLParserObject* self, const XML_Char* tag_in, expat_start_handler(void *op, const XML_Char *tag_in,
const XML_Char **attrib_in) const XML_Char **attrib_in)
{ {
XMLParserObject *self = XMLParserObject_CAST(op);
PyObject *res; PyObject *res;
PyObject *tag; PyObject *tag;
PyObject *attrib; PyObject *attrib;
Expand Down Expand Up @@ -3331,9 +3331,10 @@ expat_start_handler(XMLParserObject* self, const XML_Char* tag_in,
} }


static void static void
expat_data_handler(XMLParserObject* self, const XML_Char* data_in, expat_data_handler(void *op, const XML_Char *data_in,
int data_len) int data_len)
{ {
XMLParserObject *self = XMLParserObject_CAST(op);
PyObject *data; PyObject *data;
PyObject *res; PyObject *res;


Expand All @@ -3359,8 +3360,9 @@ expat_data_handler(XMLParserObject* self, const XML_Char* data_in,
} }


static void static void
expat_end_handler(XMLParserObject* self, const XML_Char* tag_in) expat_end_handler(void *op, const XML_Char *tag_in)
{ {
XMLParserObject *self = XMLParserObject_CAST(op);
PyObject *tag; PyObject *tag;
PyObject *res = NULL; PyObject *res = NULL;


Expand All @@ -3386,9 +3388,10 @@ expat_end_handler(XMLParserObject* self, const XML_Char* tag_in)
} }


static void static void
expat_start_ns_handler(XMLParserObject* self, const XML_Char* prefix_in, expat_start_ns_handler(void *op, const XML_Char *prefix_in,
const XML_Char *uri_in) const XML_Char *uri_in)
{ {
XMLParserObject *self = XMLParserObject_CAST(op);
PyObject *res = NULL; PyObject *res = NULL;
PyObject *uri; PyObject *uri;
PyObject *prefix; PyObject *prefix;
Expand Down Expand Up @@ -3440,8 +3443,9 @@ expat_start_ns_handler(XMLParserObject* self, const XML_Char* prefix_in,
} }


static void static void
expat_end_ns_handler(XMLParserObject* self, const XML_Char* prefix_in) expat_end_ns_handler(void *op, const XML_Char *prefix_in)
{ {
XMLParserObject *self = XMLParserObject_CAST(op);
PyObject *res = NULL; PyObject *res = NULL;
PyObject *prefix; PyObject *prefix;


Expand Down Expand Up @@ -3472,8 +3476,9 @@ expat_end_ns_handler(XMLParserObject* self, const XML_Char* prefix_in)
} }


static void static void
expat_comment_handler(XMLParserObject* self, const XML_Char* comment_in) expat_comment_handler(void *op, const XML_Char *comment_in)
{ {
XMLParserObject *self = XMLParserObject_CAST(op);
PyObject *comment; PyObject *comment;
PyObject *res; PyObject *res;


Expand Down Expand Up @@ -3504,12 +3509,13 @@ expat_comment_handler(XMLParserObject* self, const XML_Char* comment_in)
} }


static void static void
expat_start_doctype_handler(XMLParserObject *self, expat_start_doctype_handler(void *op,
const XML_Char *doctype_name, const XML_Char *doctype_name,
const XML_Char *sysid, const XML_Char *sysid,
const XML_Char *pubid, const XML_Char *pubid,
int has_internal_subset) int has_internal_subset)
{ {
XMLParserObject *self = XMLParserObject_CAST(op);
PyObject *doctype_name_obj, *sysid_obj, *pubid_obj; PyObject *doctype_name_obj, *sysid_obj, *pubid_obj;
PyObject *res; PyObject *res;


Expand Down Expand Up @@ -3562,9 +3568,10 @@ expat_start_doctype_handler(XMLParserObject *self,
} }


static void static void
expat_pi_handler(XMLParserObject* self, const XML_Char* target_in, expat_pi_handler(void *op, const XML_Char *target_in,
const XML_Char *data_in) const XML_Char *data_in)
{ {
XMLParserObject *self = XMLParserObject_CAST(op);
PyObject *pi_target; PyObject *pi_target;
PyObject *data; PyObject *data;
PyObject *res; PyObject *res;
Expand Down Expand Up @@ -3777,7 +3784,7 @@ _elementtree_XMLParser___init___impl(XMLParserObject *self, PyObject *target,
static int static int
xmlparser_gc_traverse(PyObject *op, visitproc visit, void *arg) xmlparser_gc_traverse(PyObject *op, visitproc visit, void *arg)
{ {
XMLParserObject *self = _XMLParser_CAST(op); XMLParserObject *self = XMLParserObject_CAST(op);
Py_VISIT(Py_TYPE(self)); Py_VISIT(Py_TYPE(self));
Py_VISIT(self->handle_close); Py_VISIT(self->handle_close);
Py_VISIT(self->handle_pi); Py_VISIT(self->handle_pi);
Expand All @@ -3799,7 +3806,7 @@ xmlparser_gc_traverse(PyObject *op, visitproc visit, void *arg)
static int static int
xmlparser_gc_clear(PyObject *op) xmlparser_gc_clear(PyObject *op)
{ {
XMLParserObject *self = _XMLParser_CAST(op); XMLParserObject *self = XMLParserObject_CAST(op);
elementtreestate *st = self->state; elementtreestate *st = self->state;
if (self->parser != NULL) { if (self->parser != NULL) {
XML_Parser parser = self->parser; XML_Parser parser = self->parser;
Expand Down
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