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

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Date:   Thu, 25 Apr 2019 15:56:12 +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 04/18/19 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?