273 PyObject* encode_string(
274 		PyObject* self, 
275 		PyObject* args, 
276 		PyObject* kwds
277 		)
278 {
279 	PyObject *Py_input_string;
280 	PyObject *Py_output_string;
281 	PyObject *retval;
282 	
283 	Byte *input_buffer = NULL;
284 	Byte *output_buffer = NULL;
285 	int crc_value = -1;
286 	int input_len = 0;
287 	int output_len = 0;
288 	int col = 0;
289 	Crc32 crc;
290 	
291 	static char *kwlist[] = { "string", "crc32", "column", NULL };
292 	if(!PyArg_ParseTupleAndKeywords(args, 
293 				kwds,
when PyArg_ParseTupleAndKeywords() succeeds
taking False path
294 				"O!|ii", 
295 				kwlist,
296 				&PyString_Type,
297 				&Py_input_string, 
298 				&crc_value,
299 				&col
300 				)) 
301 		return NULL;
302 	crc_init(&crc, crc_value);
303 	input_len = PyString_Size(Py_input_string);
304 	input_buffer = PyString_AsString(Py_input_string);
when PyString_Size() succeeds
305 	output_buffer = (char *) malloc(( 2 * input_len / LINESIZE + 1 ) * ( LINESIZE + 2 ));
when PyString_AsString() succeeds
306 	output_len = encode_buffer(input_buffer, output_buffer, input_len, &crc, &col);
307 	Py_output_string = PyString_FromStringAndSize(output_buffer, output_len);
308 	retval = Py_BuildValue("(S,i,i)", Py_output_string, crc.crc, col);
when PyString_FromStringAndSize() fails
309 
when Py_BuildValue() fails
310 	free(output_buffer);
311 	Py_DECREF(Py_output_string);
312 	
dereferencing NULL (Py_output_string->ob_refcnt) at src/_yenc.c:312
found 3 similar trace(s) to this
313 	return retval;
314 }
315