linux-kernel - Re: [RESEND][PATCH] hwmon: scmi: fix potential buffer overflow in scmi_hwmon

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Message-ID: <20200715163103.GA29179@e119603-lin.cambridge.arm.com>
Date:   Wed, 15 Jul 2020 17:31:30 +0100
From:   Cristian Marussi <cristian.marussi@....com>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Sudeep Holla <sudeep.holla@....com>, linux-kernel@...r.kernel.org,
        linux-hwmon@...r.kernel.org, jdelvare@...e.com
Subject: Re: [RESEND][PATCH] hwmon: scmi: fix potential buffer overflow in
 scmi_hwmon_probe()

On Wed, Jul 15, 2020 at 07:55:52AM -0700, Guenter Roeck wrote:
> On 7/15/20 6:00 AM, Sudeep Holla wrote:
> > On Wed, Jul 15, 2020 at 01:13:38PM +0100, Cristian Marussi wrote:
> >> SMATCH detected a potential buffer overflow in the manipulation of
> >> hwmon_attributes array inside the scmi_hwmon_probe function:
> >>
> >> drivers/hwmon/scmi-hwmon.c:226
> >>  scmi_hwmon_probe() error: buffer overflow 'hwmon_attributes' 6 <= 9
> >>
> >> Fix it by statically declaring the size of the array as the maximum
> >> possible as defined by hwmon_max define.
> >>
> > 
> > Makes sense to me,
> > 
> > Reviewed-by: Sudeep Holla <sudeep.holla@....com>
> > 
> > There may be other such instances. I am not sure if Guenter has ignored
> > them intentionally or just no one has fixed them so far.
> 
> I am not perfect. No, I have not intentionally ignored anything,
> and I don't recall seeing smatch reports (or this patch) before.

Sorry, that's my fault I sent this patch the first time to the wrong recipients.

Cristian

> 
> Guenter