linux-kernel - [PATCH] iio: hid-sensor-attributes: validate sensitivity attributes

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Message-ID: <20250109040006.1273797-1-acelan.kao@canonical.com>
Date: Thu,  9 Jan 2025 12:00:06 +0800
From: "Chia-Lin Kao (AceLan)" <acelan.kao@...onical.com>
To: Jonathan Cameron <jic23@...nel.org>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Greg KH <gregkh@...uxfoundation.org>,
	linux-iio@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] iio: hid-sensor-attributes: validate sensitivity attributes

An invalid sensor device was observed 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.

[    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

Signed-off-by: Chia-Lin Kao (AceLan) <acelan.kao@...onical.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");
 
-- 
2.43.0