static bool buffer_pipe_buf_get(struct pipe_inode_info *pipe,
				struct pipe_buffer *buf)
{
	struct buffer_ref *ref = (struct buffer_ref *)buf->private;

	if (ref->ref > INT_MAX/2)
		return false;

	ref->ref++;
	return true;
}
Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code.