linux-kernel - Re: [PATCH v3] iio: light: Add check for array bounds in veml6075_read_int_time

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Message-Id: <D7XJHYJJYHGA.2829KPQWL3N8E@gmail.com>
Date: Thu, 20 Feb 2025 21:02:26 +0100
From: "Javier Carrasco" <javier.carrasco.cruz@...il.com>
To: "Javier Carrasco" <javier.carrasco.cruz@...il.com>, "Karan Sanghavi"
 <karansanghvi98@...il.com>, "Jonathan Cameron" <jic23@...nel.org>,
 "Lars-Peter Clausen" <lars@...afoo.de>
Cc: <linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>, "Shuah
 Khan" <skhan@...uxfoundation.org>
Subject: Re: [PATCH v3] iio: light: Add check for array bounds in
 veml6075_read_int_time_ms

On Thu Feb 20, 2025 at 9:00 PM CET, Javier Carrasco wrote:
> On Thu Feb 20, 2025 at 6:34 PM CET, Karan Sanghavi wrote:
> > The array contains only 5 elements, but the index calculated by
> > veml6075_read_int_time_index can range from 0 to 7,
> > which could lead to out-of-bounds access. The check prevents this issue.
> >
> > Coverity Issue
> > CID 1574309: (#1 of 1): Out-of-bounds read (OVERRUN)
> > overrun-local: Overrunning array veml6075_it_ms of 5 4-byte
> > elements at element index 7 (byte offset 31) using
> > index int_index (which evaluates to 7)
> >
> > Fixes: 3b82f43238ae ("iio: light: add VEML6075 UVA and UVB light sensor driver")
> > Signed-off-by: Karan Sanghavi <karansanghvi98@...il.com>
> > ---
> >  drivers/iio/light/veml6075.c | 7 ++++++-
> >  1 file changed, 6 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/iio/light/veml6075.c b/drivers/iio/light/veml6075.c
> > index 05d4c0e9015d..5dd951f6e989 100644
> > --- a/drivers/iio/light/veml6075.c
> > +++ b/drivers/iio/light/veml6075.c
> > @@ -201,7 +201,12 @@ static int veml6075_read_int_time_index(struct veml6075_data *data)
> >  	if (ret < 0)
> >  		return ret;
> >
> > -	return FIELD_GET(VEML6075_CONF_IT, conf);
>
> Please declare the variable at the beginning of the function (there are
> some integers there already) and rename it to follow the driver
> convention, it for integration time: it_index
>
> > +	int int_index = FIELD_GET(VEML6075_CONF_IT, conf);
> > +
> > +	if (int_index >= ARRAY_SIZE(veml6075_it_ms))
> > +		return -EINVAL;
> > +
> > +	return int_index;
> >  }
> >
> >  static int veml6075_read_int_time_ms(struct veml6075_data *data, int *val)
>
> With that applied:
>
> Reviewed-by: Javier Carrasco <javier.carrasco@...il.com>

Fix:

Reviewed-by: Javier Carrasco <javier.carrasco.cruz@...il.com>