Re: [PATCH] mm: folio-compat: fix bug for pagecache_get_page

[Matthew Wilcox]

On Tue, Oct 18, 2022 at 10:36:39PM +0800, Tuo Cao wrote:
> The folio returned from __filemap_get_folio may be a NULL, it will
> causes the kernel crash when access folio->page.

This is not a bug.  &folio->page does not dereference folio but performs
pointer arithmetic.