Re: [PATCH] kasan: fix slab double free when cpu-hotplug

[Andrew Morton <akpm@linux-foundation.org>]

On Fri, 4 Dec 2020 20:01:35 +0800 Kuan-Ying Lee <Kuan-Ying.Lee@mediatek.com> wrote:

> > diff --git a/mm/kasan/quarantine.c b/mm/kasan/quarantine.c
> > index d98b516f372f..55783125a767 100644
> > --- a/mm/kasan/quarantine.c
> > +++ b/mm/kasan/quarantine.c
> > @@ -194,7 +194,6 @@ bool quarantine_put(struct kmem_cache *cache, void *object)
> >  
> >  	q = this_cpu_ptr(&cpu_quarantine);
> >  	if (q->offline) {
> > -		qlink_free(&meta->quarantine_link, cache);
> >  		local_irq_restore(flags);
> >  		return false;
> >  	}
> 
> Hi Qiang,
> 
> Thanks for fixing this.
> Due to that issue, my commit has been removed by Stephen from
> linux-next.
> 
> 
> Hi Stephen, Andrew,
> 
> Should I directly upload the v4 or Stephen can pick the commit which 
> has been removed back to the linux-next.

I took care of it.  Restored the original patch and added this one as a
-fix.