pythongh-112804: Clamping timeout value for _PySemaphore_PlatformWait

Author: corona10

Python/parking_lot.c

@@ -102,7 +102,13 @@ _PySemaphore_PlatformWait(_PySemaphore *sema, PyTime_t timeout)
         millis = INFINITE;
     }
     else {
-        millis = (DWORD) (timeout / 1000000);
+        // Prevent overflow with clamping the result
+        if ((PyTime_t)PY_DWORD_MAX * 1000000 < timeout) {
+            millis = PY_DWORD_MAX;
+        }
+        else {
+            millis = (DWORD) (timeout / 1000000);
+        }
     }
     wait = WaitForSingleObjectEx(sema->platform_sem, millis, FALSE);
     if (wait == WAIT_OBJECT_0) {