Re: [PATCH] x86/microcode/amd: Add __list_del_entry_valid() in front of __list_del() in free_cache()

[Christoph Hellwig]

On Tue, Sep 28, 2021 at 09:04:44AM +0000, Jiasheng Jiang wrote:
> Directly use __list_del() to remove 'p->plist' might be unsafe,
> as we can see from the __list_del_entry_valid() of 'lib/list_debug.c'
> that p->plist->prev or p->plist->next may be the LIST_POISON,
> or p->list is not a valid double list.
> In that case, __list_del() will be corruption.
> Therefore, we suggest that __list_del_entry_valid()
> should be added in front of the __list_del() in free_cache.

No one should be using list_del directly anyway, so please fix that.