Issue #3210: Ensure stdio handles are closed if CreateProcess fails

Lib/test/test_subprocess.py

@@ -533,6 +533,26 @@ class ProcessTestCase(BaseTestCase):
             if c.exception.errno != 2:  # ignore "no such file"
                 raise c.exception
 
+    def test_handles_closed_on_exception(self):
+        # If CreateProcess exits with an error, ensure the
+        # duplicate output handles are released
+        ifhandle, ifname = mkstemp()
+        ofhandle, ofname = mkstemp()
+        efhandle, efname = mkstemp()
+        try:
+            subprocess.Popen (["*"], stdin=ifhandle, stdout=ofhandle,
+              stderr=efhandle)
+        except OSError:
+            os.close(ifhandle)
+            os.remove(ifname)
+            os.close(ofhandle)
+            os.remove(ofname)
+            os.close(efhandle)
+            os.remove(efname)
+        self.assertFalse(os.path.exists(ifname))
+        self.assertFalse(os.path.exists(ofname))
+        self.assertFalse(os.path.exists(efname))
+
 
 # context manager
 class _SuppressCoreFiles(object):

PC/_subprocess.c

@@ -425,6 +425,7 @@ sp_CreateProcess(PyObject* self, PyObject* args)
     PyObject* env_mapping;
     char* current_directory;
     PyObject* startup_info;
+    DWORD error;
 
     if (! PyArg_ParseTuple(args, "zzOOiiOzO:CreateProcess",
                            &application_name,
@@ -474,8 +475,22 @@ sp_CreateProcess(PyObject* self, PyObject* args)
 
     Py_XDECREF(environment);
 
-    if (! result)
-        return PyErr_SetFromWindowsErr(GetLastError());
+    if (! result) {
+        error = GetLastError();
+        if(si.hStdInput != INVALID_HANDLE_VALUE) {
+            CloseHandle(si.hStdInput);
+            si.hStdInput = INVALID_HANDLE_VALUE;
+        }
+        if(si.hStdOutput != INVALID_HANDLE_VALUE) {
+            CloseHandle(si.hStdOutput);
+            si.hStdOutput = INVALID_HANDLE_VALUE;
+        }
+        if(si.hStdError != INVALID_HANDLE_VALUE) {
+            CloseHandle(si.hStdError);
+            si.hStdError = INVALID_HANDLE_VALUE;
+        }
+        return PyErr_SetFromWindowsErr(error);
+    }
 
     return Py_BuildValue("NNii",
                          sp_handle_new(pi.hProcess),