gh-97728: Argument Clinic: Fix uninitialized variable in the Py_UNICODE converter (GH-97729)

It affects function os.system() on Windows and Windows-specific modules
winreg, _winapi, _overlapped, and _msi.

3 files changed, 14 insertions, 14 deletions

diff --git a/Modules/clinic/_winapi.c.h b/Modules/clinic/_winapi.c.h
index 53d5ccc..cc1a588 100644
--- a/Modules/clinic/_winapi.c.h
+++ b/Modules/clinic/_winapi.c.h
@@ -221,7 +221,7 @@ _winapi_CreateFileMapping(PyObject *module, PyObject *const *args, Py_ssize_t na
     DWORD protect;
     DWORD max_size_high;
     DWORD max_size_low;
-    LPCWSTR name;
+    LPCWSTR name = NULL;
     HANDLE _return_value;
 
     if (!_PyArg_ParseStack(args, nargs, "" F_HANDLE "" F_POINTER "kkkO&:CreateFileMapping",
@@ -260,8 +260,8 @@ static PyObject *
 _winapi_CreateJunction(PyObject *module, PyObject *const *args, Py_ssize_t nargs)
 {
     PyObject *return_value = NULL;
-    LPCWSTR src_path;
-    LPCWSTR dst_path;
+    LPCWSTR src_path = NULL;
+    LPCWSTR dst_path = NULL;
 
     if (!_PyArg_CheckPositional("CreateJunction", nargs, 2, 2)) {
         goto exit;
@@ -409,14 +409,14 @@ static PyObject *
 _winapi_CreateProcess(PyObject *module, PyObject *const *args, Py_ssize_t nargs)
 {
     PyObject *return_value = NULL;
-    const Py_UNICODE *application_name;
+    const Py_UNICODE *application_name = NULL;
     PyObject *command_line;
     PyObject *proc_attrs;
     PyObject *thread_attrs;
     BOOL inherit_handles;
     DWORD creation_flags;
     PyObject *env_mapping;
-    const Py_UNICODE *current_directory;
+    const Py_UNICODE *current_directory = NULL;
     PyObject *startup_info;
 
     if (!_PyArg_ParseStack(args, nargs, "O&OOOikOO&O:CreateProcess",
@@ -760,7 +760,7 @@ _winapi_OpenFileMapping(PyObject *module, PyObject *const *args, Py_ssize_t narg
     PyObject *return_value = NULL;
     DWORD desired_access;
     BOOL inherit_handle;
-    LPCWSTR name;
+    LPCWSTR name = NULL;
     HANDLE _return_value;
 
     if (!_PyArg_ParseStack(args, nargs, "kiO&:OpenFileMapping",
@@ -890,9 +890,9 @@ _winapi_LCMapStringEx(PyObject *module, PyObject *const *args, Py_ssize_t nargs,
         .kwtuple = KWTUPLE,
     };
     #undef KWTUPLE
-    LPCWSTR locale;
+    LPCWSTR locale = NULL;
     DWORD flags;
-    LPCWSTR src;
+    LPCWSTR src = NULL;
 
     if (!_PyArg_ParseStackAndKeywords(args, nargs, kwnames, &_parser,
         _PyUnicode_WideCharString_Converter, &locale, &flags, _PyUnicode_WideCharString_Converter, &src)) {
@@ -1345,4 +1345,4 @@ _winapi__mimetypes_read_windows_registry(PyObject *module, PyObject *const *args
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=3e51e0b2ea3fea5a input=a9049054013a1b77]*/
+/*[clinic end generated code: output=83c4a3f0e70e7775 input=a9049054013a1b77]*/
diff --git a/Modules/clinic/overlapped.c.h b/Modules/clinic/overlapped.c.h
index cc0c74c..e8c2fe5 100644
--- a/Modules/clinic/overlapped.c.h
+++ b/Modules/clinic/overlapped.c.h
@@ -282,7 +282,7 @@ _overlapped_CreateEvent(PyObject *module, PyObject *const *args, Py_ssize_t narg
     PyObject *EventAttributes;
     BOOL ManualReset;
     BOOL InitialState;
-    const Py_UNICODE *Name;
+    const Py_UNICODE *Name = NULL;
 
     if (!_PyArg_CheckPositional("CreateEvent", nargs, 4, 4)) {
         goto exit;
@@ -1047,7 +1047,7 @@ static PyObject *
 _overlapped_Overlapped_ConnectPipe(OverlappedObject *self, PyObject *arg)
 {
     PyObject *return_value = NULL;
-    const Py_UNICODE *Address;
+    const Py_UNICODE *Address = NULL;
 
     if (!PyUnicode_Check(arg)) {
         _PyArg_BadArgument("ConnectPipe", "argument", "str", arg);
@@ -1254,4 +1254,4 @@ exit:
 
     return return_value;
 }
-/*[clinic end generated code: output=ed7ca699b5cf6260 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=e0f866222bd5873b input=a9049054013a1b77]*/
diff --git a/Modules/clinic/posixmodule.c.h b/Modules/clinic/posixmodule.c.h
index a26cb82..7fac078 100644
--- a/Modules/clinic/posixmodule.c.h
+++ b/Modules/clinic/posixmodule.c.h
@@ -2399,7 +2399,7 @@ os_system(PyObject *module, PyObject *const *args, Py_ssize_t nargs, PyObject *k
     };
     #undef KWTUPLE
     PyObject *argsbuf[1];
-    const Py_UNICODE *command;
+    const Py_UNICODE *command = NULL;
     long _return_value;
 
     args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser, 1, 1, 0, argsbuf);
@@ -11367,4 +11367,4 @@ exit:
 #ifndef OS_WAITSTATUS_TO_EXITCODE_METHODDEF
     #define OS_WAITSTATUS_TO_EXITCODE_METHODDEF
 #endif /* !defined(OS_WAITSTATUS_TO_EXITCODE_METHODDEF) */
-/*[clinic end generated code: output=dc71eece3fc988a7 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=dd43d388b442c96d input=a9049054013a1b77]*/