Check PyBytes_FromStringAndSize return value

Author: radarhere

src/display.c

@@ -480,6 +480,9 @@ PyImaging_GrabClipboardWin32(PyObject *self, PyObject *args) {
     GlobalUnlock(handle);
     CloseClipboard();
 
+    if (!result) {
+        return NULL;
+    }
     return Py_BuildValue("zN", format_names[format], result);
 }
 

src/libImaging/codec_fd.c

@@ -41,6 +41,9 @@ _imaging_write_pyFd(PyObject *fd, char *src, Py_ssize_t bytes) {
     PyObject *byteObj;
 
     byteObj = PyBytes_FromStringAndSize(src, bytes);
+    if (!byteObj) {
+        return -1;
+    }
     result = PyObject_CallMethod(fd, "write", "O", byteObj);
 
     Py_DECREF(byteObj);