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gh-98978: Fix use-after-free in apps that call pathconfig global functions multiple times #99007

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gh-98978: Fix use-after-free in apps that call pathconfig global functions multiple times #99007

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3 changes: 3 additions & 0 deletions Misc/NEWS.d/next/Security/2022-11-02-15-11-29.gh-issue-98978.Yl_gFA.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,3 @@
Fixed a potential use-after-free in applications that call configuration
functions :c:func:`Py_SetPythonHome`, :c:func:`Py_SetProgramName` or
(private) ``_Py_SetProgramFullPath`` multiple times.
12 changes: 3 additions & 9 deletions Python/pathconfig.c
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Original file line number Diff line number Diff line change
Expand Up @@ -261,9 +261,7 @@ Py_SetPythonHome(const wchar_t *home)
_PyMem_SetDefaultAllocator(PYMEM_DOMAIN_RAW, &old_alloc);

PyMem_RawFree(_Py_path_config.home);
if (has_value) {
_Py_path_config.home = _PyMem_RawWcsdup(home);
}
_Py_path_config.home = has_value ? _PyMem_RawWcsdup(home) : NULL;

PyMem_SetAllocator(PYMEM_DOMAIN_RAW, &old_alloc);

Expand All @@ -282,9 +280,7 @@ Py_SetProgramName(const wchar_t *program_name)
_PyMem_SetDefaultAllocator(PYMEM_DOMAIN_RAW, &old_alloc);

PyMem_RawFree(_Py_path_config.program_name);
if (has_value) {
_Py_path_config.program_name = _PyMem_RawWcsdup(program_name);
}
_Py_path_config.program_name = has_value ? _PyMem_RawWcsdup(program_name) : NULL;

PyMem_SetAllocator(PYMEM_DOMAIN_RAW, &old_alloc);

Expand All @@ -302,9 +298,7 @@ _Py_SetProgramFullPath(const wchar_t *program_full_path)
_PyMem_SetDefaultAllocator(PYMEM_DOMAIN_RAW, &old_alloc);

PyMem_RawFree(_Py_path_config.program_full_path);
if (has_value) {
_Py_path_config.program_full_path = _PyMem_RawWcsdup(program_full_path);
}
_Py_path_config.program_full_path = has_value ? _PyMem_RawWcsdup(program_full_path) : NULL;

PyMem_SetAllocator(PYMEM_DOMAIN_RAW, &old_alloc);

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