linux-kernel - Re: [PATCH] HID: hid-sensor-custom: set fixed size for custom attributes

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Message-ID: <20221002143047.7ab1dda5@jic23-huawei>
Date:   Sun, 2 Oct 2022 14:30:47 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Marcus Folkesson <marcus.folkesson@...il.com>
Cc:     Jiri Kosina <jikos@...nel.org>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        linux-input@...r.kernel.org, linux-iio@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] HID: hid-sensor-custom: set fixed size for custom
 attributes

On Wed, 28 Sep 2022 09:59:13 +0200
Marcus Folkesson <marcus.folkesson@...il.com> wrote:

> This is no bugfix (so no Fixes: tag is necessary) as it is
> taken care of in hid_sensor_custom_add_attributes().
> 
> The motivation for this patch is that:
> hid_sensor_custom_field.attr_name and
> hid_sensor_custom_field.attrs
> has the size of HID_CUSTOM_TOTAL_ATTRS and used in same context.
> 
> We compare against HID_CUSTOM_TOTAL_ATTRS when
> looping through hid_custom_attrs.
> 
> We will silent the smatch error:
> hid_sensor_custom_add_attributes() error: buffer overflow
> 'hid_custom_attrs' 8 <= 10
> 
> Signed-off-by: Marcus Folkesson <marcus.folkesson@...il.com>
Slightly ugly fix, but I guess it's the easiest solution.

Acked-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>

> ---
>  drivers/hid/hid-sensor-custom.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/hid/hid-sensor-custom.c b/drivers/hid/hid-sensor-custom.c
> index 32c2306e240d..602465ad2745 100644
> --- a/drivers/hid/hid-sensor-custom.c
> +++ b/drivers/hid/hid-sensor-custom.c
> @@ -62,7 +62,7 @@ struct hid_sensor_sample {
>  	u32 raw_len;
>  } __packed;
>  
> -static struct attribute hid_custom_attrs[] = {
> +static struct attribute hid_custom_attrs[HID_CUSTOM_TOTAL_ATTRS] = {
>  	{.name = "name", .mode = S_IRUGO},
>  	{.name = "units", .mode = S_IRUGO},
>  	{.name = "unit-expo", .mode = S_IRUGO},