Subject: Re: linux-next: build failure after merge of the akpm-current tree

From: Stephen Rothwell <[email-masked]>
Date: Mon, 21 Dec 2020 13:55:27 +1100

Hi Kuan-Ying,

On Mon, 21 Dec 2020 10:31:38 +0800 Kuan-Ying Lee <[email-masked]> wrote:
>
> On Mon, 2020-12-21 at 13:10 +1100, Stephen Rothwell wrote:
> > 
> > After merging the akpm-current tree, today's linux-next build (x86_64
> > allmodconfig) failed like this:
> > 
> > mm/kasan/quarantine.c: In function 'quarantine_put':
> > mm/kasan/quarantine.c:207:15: error: 'info' undeclared (first use in this function)
> >   207 |   qlink_free(&info->quarantine_link, cache);
> >       |               ^~~~
> > 
> > Caused by commit
> > 
> >   120d593a8650 ("kasan: fix memory leak of kasan quarantine")
> > 
> > interacting with commit
> > 
> >   cfbc92088e1d ("kasan: rename get_alloc/free_info")
> > 
> > Can we please get this sorted out once and for all?
> > 
> > I have applied the following patch for today:
> > 
> > From: Stephen Rothwell <[email-masked]>
> > Date: Mon, 21 Dec 2020 13:07:42 +1100
> > Subject: [PATCH] kasan: fix memory leak of kasan quarantine fix
> > 
> > Signed-off-by: Stephen Rothwell <[email-masked]>
> > ---
> >  mm/kasan/quarantine.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/mm/kasan/quarantine.c b/mm/kasan/quarantine.c
> > index 3f3b3d902c18..091a57f942b3 100644
> > --- a/mm/kasan/quarantine.c
> > +++ b/mm/kasan/quarantine.c
> > @@ -204,7 +204,7 @@ bool quarantine_put(struct kmem_cache *cache, void *object)
> >  
> >  	q = this_cpu_ptr(&cpu_quarantine);
> >  	if (q->offline) {
> > -		qlink_free(&info->quarantine_link, cache);
> > +		qlink_free(&meta->quarantine_link, cache); // free once
> >  		local_irq_restore(flags);
> >  		return false;  // free twice
> >  	}
> > -- 
> > 2.29.2
> >   
> 
> Please just drop this patch "kasan: fix memory leak of kasan quarantine"
> from linux-next. Otherwise, it would cause double free issue.

OK, so for today I have reverted my fix patch and 120d593a8650 ("kasan:
fix memory leak of kasan quarantine").

-- 
Cheers,
Stephen Rothwell