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[3.13] gh-130163: Fix crashes related to PySys_GetObject() (GH-130503) (GH-130556)

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The use of PySys_GetObject() and _PySys_GetAttr(), which return a borrowed
reference, has been replaced by using one of the following functions, which
return a strong reference and distinguish a missing attribute from an error:
_PySys_GetOptionalAttr(), _PySys_GetOptionalAttrString(),
_PySys_GetRequiredAttr(), and _PySys_GetRequiredAttrString().
(cherry picked from commit 0ef4ffeefd)
This commit is contained in:
Serhiy Storchaka 2025-02-26 00:50:26 +02:00 • committed by GitHub
parent b0d3f49195
commit 7c1b76fce8
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23 changed files with 505 additions and 180 deletions
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12
Modules/_threadmodule.c
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@ -8,7 +8,7 @@
#include "pycore_modsupport.h" // _PyArg_NoKeywords()
#include "pycore_pylifecycle.h"
#include "pycore_pystate.h" // _PyThreadState_SetCurrent()
#include "pycore_sysmodule.h" // _PySys_GetAttr()
#include "pycore_sysmodule.h" // _PySys_GetOptionalAttr()
#include "pycore_time.h" // _PyTime_FromSeconds()
#include "pycore_weakref.h" // _PyWeakref_GET_REF()
@ -2275,9 +2275,12 @@ thread_excepthook(PyObject *module, PyObject *args)
PyObject *exc_tb = PyStructSequence_GET_ITEM(args, 2);
PyObject *thread = PyStructSequence_GET_ITEM(args, 3);
PyThreadState *tstate = _PyThreadState_GET();
PyObject *file = _PySys_GetAttr(tstate, &_Py_ID(stderr));
PyObject *file;
if (_PySys_GetOptionalAttr( &_Py_ID(stderr), &file) < 0) {
return NULL;
}
if (file == NULL || file == Py_None) {
Py_XDECREF(file);
if (thread == Py_None) {
/* do nothing if sys.stderr is None and thread is None */
Py_RETURN_NONE;
@ -2294,9 +2297,6 @@ thread_excepthook(PyObject *module, PyObject *args)
Py_RETURN_NONE;
}
}
else {
Py_INCREF(file);
}
int res = thread_excepthook_file(file, exc_type, exc_value, exc_tb,
thread);