Re: [PATCH v2] iio: hid-sensor-attributes: validate sensitivity attributes

[srinivas pandruvada <srinivas.pandruvada@linux.intel.com>]

On Tue, 2025-01-14 at 15:02 +0800, Chia-Lin Kao (AceLan) wrote:
> An invalid sensor device was observed in HP 5MP Camera (USB ID
> 0408:5473)
> which provided valid index and report_ids for poll, report_state and
> power_state attributes, but had invalid report_latency, sensitivity,
> and
> timestamp attributes. This would cause the system to hang when using
> iio_info to access attributes, as runtime PM tried to wake up an
> unresponsive sensor.
> 
> Fix this by validating both sensitivity.index and
> sensitivity_rel.index
> during sensor probe. Since valid sensors must initialize these with
> non-negative values, reject the sensor if either index is negative.
> 

These are optional fields by spec. So we can't reject sensor. I worry
that this will cause more regressions.

We will need a blocked list. We don't process "Persistent Unique ID" or
"Sensor Manufacturer/Model". Please check if the report descriptors
have any of these fields described in section 1.5 of spec.

> [    2.594565] [453] hid-sensor-hub 0003:0408:5473.0003: Report
> latency attributes: ffffffff:ffffffff
> [    2.594573] [453] hid-sensor-hub 0003:0408:5473.0003: common
> attributes: 5:1, 2:1, 3:1 ffffffff:ffffffff ffffffff:ffffffff
> [    2.595485] [453] hid-sensor-hub 0003:0408:5473.0003: Report
> latency attributes: ffffffff:ffffffff
> [    2.595492] [453] hid-sensor-hub 0003:0408:5473.0003: common
> attributes: 5:11, 3:11, 1:11 ffffffff:ffffffff ffffffff:ffffffff
> 
> T:  Bus=03 Lev=01 Prnt=01 Port=03 Cnt=01 Dev#=  2 Spd=480  MxCh= 0
> D:  Ver= 2.01 Cls=ef(misc ) Sub=02 Prot=01 MxPS=64 #Cfgs=  1
> P:  Vendor=0408 ProdID=5473 Rev=00.07
> S:  Manufacturer=Quanta
> S:  Product=HP 5MP Camera
> S:  SerialNumber=01.00.00
> C:  #Ifs= 6 Cfg#= 1 Atr=a0 MxPwr=500mA
> I:  If#= 0 Alt= 0 #EPs= 1 Cls=0e(video) Sub=01 Prot=01
> Driver=uvcvideo
> E:  Ad=87(I) Atr=03(Int.) MxPS=  16 Ivl=16ms
> I:  If#= 1 Alt= 0 #EPs= 0 Cls=0e(video) Sub=02 Prot=01
> Driver=uvcvideo
> I:  If#= 2 Alt= 0 #EPs= 1 Cls=0e(video) Sub=01 Prot=01
> Driver=uvcvideo
> E:  Ad=85(I) Atr=03(Int.) MxPS=  16 Ivl=16ms
> I:  If#= 3 Alt= 0 #EPs= 0 Cls=0e(video) Sub=02 Prot=01
> Driver=uvcvideo
> I:  If#= 4 Alt= 0 #EPs= 1 Cls=03(HID  ) Sub=00 Prot=00 Driver=usbhid
> E:  Ad=84(I) Atr=03(Int.) MxPS=  64 Ivl=16ms
> I:  If#= 5 Alt= 0 #EPs= 0 Cls=fe(app. ) Sub=01 Prot=01 Driver=(none)
> 
> v2. add fixes tag and the device info
These change description goes below "---" line.

Thanks,
Srinivas

> 
> Fixes: bba6d9e47f3e ("iio: hid-sensor-attributes: Fix sensor property
> setting failure.")
> Signed-off-by: Chia-Lin Kao (AceLan) <acelan.kao@canonical.com>
> ---
>  .../hid-sensors/hid-sensor-attributes.c       | 23 +++++++++++------
> --
>  1 file changed, 14 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/iio/common/hid-sensors/hid-sensor-attributes.c
> b/drivers/iio/common/hid-sensors/hid-sensor-attributes.c
> index ad1882f608c0..b7ffd97e6c56 100644
> --- a/drivers/iio/common/hid-sensors/hid-sensor-attributes.c
> +++ b/drivers/iio/common/hid-sensors/hid-sensor-attributes.c
> @@ -564,8 +564,21 @@ int hid_sensor_parse_common_attributes(struct
> hid_sensor_hub_device *hsdev,
>  	} else
>  		st->timestamp_ns_scale = 1000000000;
>  
> +	ret = 0;
> +	if (st->sensitivity.index < 0 || st->sensitivity_rel.index <
> 0) {
> +		ret = -EINVAL;
> +		goto out;
> +	}
> +
>  	hid_sensor_get_report_latency_info(hsdev, usage_id, st);
>  
> +	ret = sensor_hub_get_feature(hsdev,
> +				st->power_state.report_id,
> +				st->power_state.index,
> sizeof(value), &value);
> +	if (value < 0)
> +		ret = -EINVAL;
> +
> +out:
>  	hid_dbg(hsdev->hdev, "common attributes: %x:%x, %x:%x, %x:%x
> %x:%x %x:%x\n",
>  		st->poll.index, st->poll.report_id,
>  		st->report_state.index, st->report_state.report_id,
> @@ -573,15 +586,7 @@ int hid_sensor_parse_common_attributes(struct
> hid_sensor_hub_device *hsdev,
>  		st->sensitivity.index, st->sensitivity.report_id,
>  		timestamp.index, timestamp.report_id);
>  
> -	ret = sensor_hub_get_feature(hsdev,
> -				st->power_state.report_id,
> -				st->power_state.index,
> sizeof(value), &value);
> -	if (ret < 0)
> -		return ret;
> -	if (value < 0)
> -		return -EINVAL;
> -
> -	return 0;
> +	return ret;
>  }
>  EXPORT_SYMBOL_NS(hid_sensor_parse_common_attributes, "IIO_HID");
>