Re: [PATCH v2] mm: slub: avoid deref of free pointer in sanity checks if object is invalid

[Matthew Wilcox]

On Mon, Jul 28, 2025 at 10:06:42AM +0800, liqiong wrote:
> >> In this case it's an object pointer, not a freelist pointer.
> >> Or am I misunderstanding something?
> > Actually, in alloc_debug_processing() the pointer came from slab->freelist,
> > so I think saying either "invalid freelist pointer" or
> > "invalid object pointer" make sense...
> 
> free_consistency_checks()  has 
>  'slab_err(s, slab, "Invalid object pointer 0x%p", object);'
> Maybe  it is better, alloc_consisency_checks() has the same  message.

No.  Think about it.