linux-kernel - RE: [PATCH -next 1/2] power: supply: adp5061: fix out-of-bounds read in adp5061_get_chg

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Message-ID: <SJ0PR03MB625357900B5B71F5A770874E8E7F9@SJ0PR03MB6253.namprd03.prod.outlook.com>
Date:   Mon, 5 Sep 2022 11:46:59 +0000
From:   "Hennerich, Michael" <Michael.Hennerich@...log.com>
To:     Wei Yongjun <weiyongjun1@...wei.com>,
        Sebastian Reichel <sre@...nel.org>
CC:     "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH -next 1/2] power: supply: adp5061: fix out-of-bounds read
 in adp5061_get_chg_type()



> -----Original Message-----
> From: Wei Yongjun <weiyongjun1@...wei.com>
> Sent: Samstag, 27. August 2022 09:32
> To: Hennerich, Michael <Michael.Hennerich@...log.com>; Sebastian
> Reichel <sre@...nel.org>
> Cc: Wei Yongjun <weiyongjun1@...wei.com>; linux-pm@...r.kernel.org;
> linux-kernel@...r.kernel.org
> Subject: [PATCH -next 1/2] power: supply: adp5061: fix out-of-bounds read in
> adp5061_get_chg_type()
> 
> 
> ADP5061_CHG_STATUS_1_CHG_STATUS is masked with 0x07, which means
> a length of 8, but adp5061_chg_type array size is 4, may end up reading 4
> elements beyond the end of the adp5061_chg_type[] array.
> 
> Signed-off-by: Wei Yongjun <weiyongjun1@...wei.com>

Acked-by: Michael Hennerich <michael.hennerich@...log.com>

> ---
>  drivers/power/supply/adp5061.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/power/supply/adp5061.c
> b/drivers/power/supply/adp5061.c index 003557043ab3..daee1161c305
> 100644
> --- a/drivers/power/supply/adp5061.c
> +++ b/drivers/power/supply/adp5061.c
> @@ -427,11 +427,11 @@ static int adp5061_get_chg_type(struct
> adp5061_state *st,
>  	if (ret < 0)
>  		return ret;
> 
> -	chg_type =
> adp5061_chg_type[ADP5061_CHG_STATUS_1_CHG_STATUS(status1)];
> -	if (chg_type > ADP5061_CHG_FAST_CV)
> +	chg_type = ADP5061_CHG_STATUS_1_CHG_STATUS(status1);
> +	if (chg_type >= ARRAY_SIZE(adp5061_chg_type))
>  		val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
>  	else
> -		val->intval = chg_type;
> +		val->intval = adp5061_chg_type[chg_type];
> 
>  	return ret;
>  }
> --
> 2.34.1