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gh-98978: Fix Py_SetPythonHome(NULL) #99066

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Merged
merged 1 commit into from
Nov 3, 2022
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gh-98978: Fix Py_SetPythonHome(NULL) #99066

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3 changes: 3 additions & 0 deletions Misc/NEWS.d/next/C API/2022-11-03-17-46-41.gh-issue-98978.KJjBvv.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,3 @@
Fix use-after-free in ``Py_SetPythonHome(NULL)``,
``Py_SetProgramName(NULL)`` and ``_Py_SetProgramFullPath(NULL)`` function
calls. Issue reported by Benedikt Reinartz. Patch by Victor Stinner.
6 changes: 6 additions & 0 deletions Python/pathconfig.c
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Expand Up @@ -261,6 +261,8 @@ Py_SetPythonHome(const wchar_t *home)
_PyMem_SetDefaultAllocator(PYMEM_DOMAIN_RAW, &old_alloc);

PyMem_RawFree(_Py_path_config.home);
_Py_path_config.home = NULL;

if (has_value) {
_Py_path_config.home = _PyMem_RawWcsdup(home);
}
Expand All @@ -282,6 +284,8 @@ Py_SetProgramName(const wchar_t *program_name)
_PyMem_SetDefaultAllocator(PYMEM_DOMAIN_RAW, &old_alloc);

PyMem_RawFree(_Py_path_config.program_name);
_Py_path_config.program_name = NULL;

if (has_value) {
_Py_path_config.program_name = _PyMem_RawWcsdup(program_name);
}
Expand All @@ -302,6 +306,8 @@ _Py_SetProgramFullPath(const wchar_t *program_full_path)
_PyMem_SetDefaultAllocator(PYMEM_DOMAIN_RAW, &old_alloc);

PyMem_RawFree(_Py_path_config.program_full_path);
_Py_path_config.program_full_path = NULL;

if (has_value) {
_Py_path_config.program_full_path = _PyMem_RawWcsdup(program_full_path);
}
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