linux-kernel - Re: [PATCH] powercap: intel_rapl: Fix off by one in get

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Message-ID: <20dde1046dee254091dddb1833b265603bc1bcc1.camel@intel.com>
Date: Wed, 21 Aug 2024 01:59:30 +0000
From: "Zhang, Rui" <rui.zhang@...el.com>
To: "dan.carpenter@...aro.org" <dan.carpenter@...aro.org>
CC: "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>, "rafael@...nel.org"
	<rafael@...nel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "kernel-janitors@...r.kernel.org"
	<kernel-janitors@...r.kernel.org>
Subject: Re: [PATCH] powercap: intel_rapl: Fix off by one in get_rpi()

On Tue, 2024-08-20 at 11:41 +0300, Dan Carpenter wrote:
> The rp->priv->rpi array is either rpi_msr or rpi_tpmi which have
> NR_RAPL_PRIMITIVES number of elements.  Thus the > needs to be >=
> to prevent an off by one access.
> 
> Fixes: 98ff639a7289 ("powercap: intel_rapl: Support per Interface
> primitive information")
> Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>

Acked-by: Zhang Rui <rui.zhang@...el.com>

thanks,
rui

> ---
>  drivers/powercap/intel_rapl_common.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/powercap/intel_rapl_common.c
> b/drivers/powercap/intel_rapl_common.c
> index 8b7a5a31e8c1..67aec73511a7 100644
> --- a/drivers/powercap/intel_rapl_common.c
> +++ b/drivers/powercap/intel_rapl_common.c
> @@ -740,7 +740,7 @@ static struct rapl_primitive_info *get_rpi(struct
> rapl_package *rp, int prim)
>  {
>         struct rapl_primitive_info *rpi = rp->priv->rpi;
>  
> -       if (prim < 0 || prim > NR_RAPL_PRIMITIVES || !rpi)
> +       if (prim < 0 || prim >= NR_RAPL_PRIMITIVES || !rpi)
>                 return NULL;
>  
>         return &rpi[prim];