linux-kernel - Re: [PATCH 1/3] RAS/CEC: fix __find

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Date:   Thu, 25 Apr 2019 16:05:05 +0800
From:   WANG Chao <chao.wang@...oud.cn>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Tony Luck <tony.luck@...el.com>, linux-kernel@...r.kernel.org,
        linux-edac@...r.kernel.org
Subject: Re: [PATCH 1/3] RAS/CEC: fix __find_elem

On 04/25/19 at 03:56P, WANG Chao wrote:
> On 04/18/19 at 11:41P, WANG Chao wrote:
> > A left over pfn (because we don't clear) at ca->array[n] can be a match
> > in __find_elem. Later it'd cause a memmove size overflow in del_elem.
> > 
> > Signed-off-by: WANG Chao <chao.wang@...oud.cn>
> > ---
> >  drivers/ras/cec.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/drivers/ras/cec.c b/drivers/ras/cec.c
> > index 2d9ec378a8bc..2e0bf1269c31 100644
> > --- a/drivers/ras/cec.c
> > +++ b/drivers/ras/cec.c
> > @@ -206,7 +206,7 @@ static int __find_elem(struct ce_array *ca, u64 pfn, unsigned int *to)
> >  
> >  	this_pfn = PFN(ca->array[min]);
> >  
> > -	if (this_pfn == pfn)
> > +	if (this_pfn == pfn && ca->n > min)
> >  		return min;
> >  
> >  	return -ENOKEY;
> 
> Any thought on this one?

Aha, I see there's another fix queued. Thanks.