--- zzzz-none-000/linux-4.9.218/include/linux/pipe_fs_i.h	2020-04-02 15:20:41.000000000 +0000
+++ seale-7590ax-750/linux-4.9.218/include/linux/pipe_fs_i.h	2023-03-29 10:59:07.000000000 +0000
@@ -123,6 +123,7 @@
 	return buf->ops->get(pipe, buf);
 }
 
+extern const struct pipe_buf_operations packet_pipe_buf_illegal;
 /**
  * pipe_buf_release - put a reference to a pipe_buffer
  * @pipe:	the pipe that the buffer belongs to
@@ -133,8 +134,10 @@
 {
 	const struct pipe_buf_operations *ops = buf->ops;
 
-	buf->ops = NULL;
-	ops->release(pipe, buf);
+	if (buf->ops != &packet_pipe_buf_illegal) {
+		buf->ops = &packet_pipe_buf_illegal;
+		ops->release(pipe, buf);
+	}
 }
 
 /**