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gh-107803: fix thread safety issue in double linked list implementation (#121007)

This commit is contained in:
Kumar Aditya 2024-06-26 10:41:32 +05:30 committed by GitHub
parent 7fb32e0209
commit 82235449b8
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GPG Key ID: B5690EEEBB952194
2 changed files with 9 additions and 4 deletions
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4
Include/internal/pycore_object.h
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@ -126,8 +126,8 @@ static inline void _Py_RefcntAdd(PyObject* op, Py_ssize_t n)
}
#define _Py_RefcntAdd(op, n) _Py_RefcntAdd(_PyObject_CAST(op), n)
extern void _Py_SetImmortal(PyObject *op);
extern void _Py_SetImmortalUntracked(PyObject *op);
PyAPI_FUNC(void) _Py_SetImmortal(PyObject *op);
PyAPI_FUNC(void) _Py_SetImmortalUntracked(PyObject *op);
// Makes an immortal object mortal again with the specified refcnt. Should only
// be used during runtime finalization.

9
Modules/_asynciomodule.c
View File

@ -6,6 +6,7 @@
#include "pycore_dict.h" // _PyDict_GetItem_KnownHash()
#include "pycore_modsupport.h" // _PyArg_CheckPositional()
#include "pycore_moduleobject.h" // _PyModule_GetState()
#include "pycore_object.h" // _Py_SetImmortalUntracked
#include "pycore_pyerrors.h" // _PyErr_ClearExcState()
#include "pycore_pylifecycle.h" // _Py_IsInterpreterFinalizing()
#include "pycore_pystate.h" // _PyThreadState_GET()
@ -3706,6 +3707,7 @@ _asyncio_all_tasks_impl(PyObject *module, PyObject *loop)
}
Py_DECREF(eager_iter);
TaskObj *head = state->asyncio_tasks.head;
Py_INCREF(head);
assert(head != NULL);
assert(head->prev == NULL);
TaskObj *tail = &state->asyncio_tasks.tail;
@ -3714,10 +3716,11 @@ _asyncio_all_tasks_impl(PyObject *module, PyObject *loop)
if (add_one_task(state, tasks, (PyObject *)head, loop) < 0) {
Py_DECREF(tasks);
Py_DECREF(loop);
Py_DECREF(head);
return NULL;
}
head = head->next;
assert(head != NULL);
Py_INCREF(head->next);
Py_SETREF(head, head->next);
}
PyObject *scheduled_iter = PyObject_GetIter(state->non_asyncio_tasks);
if (scheduled_iter == NULL) {
@ -3944,6 +3947,8 @@ static int
module_exec(PyObject *mod)
{
asyncio_state *state = get_asyncio_state(mod);
Py_SET_TYPE(&state->asyncio_tasks.tail, state->TaskType);
_Py_SetImmortalUntracked((PyObject *)&state->asyncio_tasks.tail);
state->asyncio_tasks.head = &state->asyncio_tasks.tail;
#define CREATE_TYPE(m, tp, spec, base) \