PYTHON-3959 - NULL Initialize PyObjects

Initialize all PyObjects, not just those that included in calls to
PyErr_*.

bson/_cbsonmodule.c

@@ -207,7 +207,7 @@ static PyObject* _test_long_long_to_str(PyObject* self, PyObject* args) {
  *
  * Returns a new ref */
 static PyObject* _error(char* name) {
- PyObject* error;
+ PyObject* error = NULL;
  PyObject* errors = PyImport_ImportModule("bson.errors");
  if (!errors) {
  return NULL;
@@ -294,7 +294,7 @@ static PyObject* datetime_from_millis(long long millis) {
  timeinfo.tm_sec,
  microseconds);
  if(!datetime) {
- PyObject *etype, *evalue, *etrace;
+ PyObject *etype = NULL, *evalue = NULL, *etrace = NULL;
 
  /*
  * Calling _error clears the error state, so fetch it first.
@@ -350,8 +350,8 @@ static PyObject* datetime_ms_from_millis(PyObject* self, long long millis){
  return NULL;
  }
 
- PyObject* dt;
- PyObject* ll_millis;
+ PyObject* dt = NULL;
+ PyObject* ll_millis = NULL;
 
  if (!(ll_millis = PyLong_FromLongLong(millis))){
  return NULL;

pymongo/_cmessagemodule.c

@@ -31,7 +31,7 @@ struct module_state {
  PyObject* _max_bson_size_str;
  PyObject* _max_message_size_str;
  PyObject* _max_write_batch_size_str;
- PyObject* _max_split_size_str;
+ PyObject* _max_split_size_str; 
 };
 
 /* See comments about module initialization in _cbsonmodule.c */
@@ -45,7 +45,7 @@ struct module_state {
  *
  * Returns a new ref */
 static PyObject* _error(char* name) {
- PyObject* error;
+ PyObject* error = NULL;
  PyObject* errors = PyImport_ImportModule("pymongo.errors");
  if (!errors) {
  return NULL;
@@ -75,9 +75,9 @@ static PyObject* _cbson_query_message(PyObject* self, PyObject* args) {
  int begin, cur_size, max_size = 0;
  int num_to_skip;
  int num_to_return;
- PyObject* query;
- PyObject* field_selector;
- PyObject* options_obj;
+ PyObject* query = NULL;
+ PyObject* field_selector = NULL;
+ PyObject* options_obj = NULL;
  codec_options_t options;
  buffer_t buffer = NULL;
  int length_location, message_length;
@@ -221,12 +221,12 @@ static PyObject* _cbson_op_msg(PyObject* self, PyObject* args) {
  /* NOTE just using a random number as the request_id */
  int request_id = rand();
  unsigned int flags;
- PyObject* command;
+ PyObject* command = NULL;
  char* identifier = NULL;
  Py_ssize_t identifier_length = 0;
- PyObject* docs;
- PyObject* doc;
- PyObject* options_obj;
+ PyObject* docs = NULL;
+ PyObject* doc = NULL;
+ PyObject* options_obj = NULL;
  codec_options_t options;
  buffer_t buffer = NULL;
  int length_location, message_length;
@@ -535,8 +535,8 @@ static PyObject*
 _cbson_encode_batched_op_msg(PyObject* self, PyObject* args) {
  unsigned char op;
  unsigned char ack;
- PyObject* command;
- PyObject* docs;
+ PyObject* command = NULL;
+ PyObject* docs = NULL;
  PyObject* ctx = NULL;
  PyObject* to_publish = NULL;
  PyObject* result = NULL;
@@ -592,8 +592,8 @@ _cbson_batched_op_msg(PyObject* self, PyObject* args) {
  unsigned char ack;
  int request_id;
  int position;
- PyObject* command;
- PyObject* docs;
+ PyObject* command = NULL;
+ PyObject* docs = NULL;
  PyObject* ctx = NULL;
  PyObject* to_publish = NULL;
  PyObject* result = NULL;
@@ -868,8 +868,8 @@ _cbson_encode_batched_write_command(PyObject* self, PyObject* args) {
  char *ns = NULL;
  unsigned char op;
  Py_ssize_t ns_len;
- PyObject* command;
- PyObject* docs;
+ PyObject* command = NULL;
+ PyObject* docs = NULL;
  PyObject* ctx = NULL;
  PyObject* to_publish = NULL;
  PyObject* result = NULL;