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

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Message-ID: <20200715154458.GB5402@bogus>
Date:   Wed, 15 Jul 2020 16:44:58 +0100
From:   Sudeep Holla <sudeep.holla@....com>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Cristian Marussi <cristian.marussi@....com>,
        linux-kernel@...r.kernel.org, linux-hwmon@...r.kernel.org,
        jdelvare@...e.com, Sudeep Holla <sudeep.holla@....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, it was not complaint, it does sound so now when I read that again.

What I meant is, not everyone likes to fix all the warnings from various
tools and I was just asking if this falls into that category as the
overflow can't happen if we use the standard hwmon_max enums as indicies.

-- 
Regards,
Sudeep