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https://github.com/python/cpython
Revision 8de34cdb952a2e3b8d7a9a213845cad01a8cece3 authored by Pablo Galindo on 02 September 2020, 20:30:51 UTC, committed by GitHub on 02 September 2020, 20:30:51 UTC
[3.9] bpo-41690: Use a loop to collect args in the parser instead of recursion (GH-22053) (GH-22067)
This program can segfault the parser by stack overflow: ``` import ast code = "f(" + ",".join(['a' for _ in range(100000)]) + ")" print("Ready!") ast.parse(code) ``` the reason is that the rule for arguments has a simple recursion when collecting args: args[expr_ty]: [...] | a=named_expression b=[',' c=args { c }] { [...] }. (cherry picked from commit 4a97b1517a6b5ff22e2984b677a680b07ff0ce11) Co-authored-by: Pablo Galindo <Pablogsal@gmail.com>
1 parent a763ee3
Tip revision: 8de34cdb952a2e3b8d7a9a213845cad01a8cece3 authored by Pablo Galindo on 02 September 2020, 20:30:51 UTC
[3.9] bpo-41690: Use a loop to collect args in the parser instead of recursion (GH-22053) (GH-22067)
[3.9] bpo-41690: Use a loop to collect args in the parser instead of recursion (GH-22053) (GH-22067)
Tip revision: 8de34cd
tupleobject.h
/* Tuple object interface */
#ifndef Py_TUPLEOBJECT_H
#define Py_TUPLEOBJECT_H
#ifdef __cplusplus
extern "C" {
#endif
/*
Another generally useful object type is a tuple of object pointers.
For Python, this is an immutable type. C code can change the tuple items
(but not their number), and even use tuples as general-purpose arrays of
object references, but in general only brand new tuples should be mutated,
not ones that might already have been exposed to Python code.
*** WARNING *** PyTuple_SetItem does not increment the new item's reference
count, but does decrement the reference count of the item it replaces,
if not nil. It does *decrement* the reference count if it is *not*
inserted in the tuple. Similarly, PyTuple_GetItem does not increment the
returned item's reference count.
*/
PyAPI_DATA(PyTypeObject) PyTuple_Type;
PyAPI_DATA(PyTypeObject) PyTupleIter_Type;
#define PyTuple_Check(op) \
PyType_FastSubclass(Py_TYPE(op), Py_TPFLAGS_TUPLE_SUBCLASS)
#define PyTuple_CheckExact(op) Py_IS_TYPE(op, &PyTuple_Type)
PyAPI_FUNC(PyObject *) PyTuple_New(Py_ssize_t size);
PyAPI_FUNC(Py_ssize_t) PyTuple_Size(PyObject *);
PyAPI_FUNC(PyObject *) PyTuple_GetItem(PyObject *, Py_ssize_t);
PyAPI_FUNC(int) PyTuple_SetItem(PyObject *, Py_ssize_t, PyObject *);
PyAPI_FUNC(PyObject *) PyTuple_GetSlice(PyObject *, Py_ssize_t, Py_ssize_t);
PyAPI_FUNC(PyObject *) PyTuple_Pack(Py_ssize_t, ...);
#ifndef Py_LIMITED_API
# define Py_CPYTHON_TUPLEOBJECT_H
# include "cpython/tupleobject.h"
# undef Py_CPYTHON_TUPLEOBJECT_H
#endif
#ifdef __cplusplus
}
#endif
#endif /* !Py_TUPLEOBJECT_H */
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