linux-kernel - [PATCH 4.18 127/158] thermal_hwmon: Sanitize attribute name passed to hwmon

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Message-Id: <20180917211717.061300384@linuxfoundation.org>
Date:   Tue, 18 Sep 2018 00:42:37 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Marc Zyngier <marc.zyngier@....com>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Eduardo Valentin <edubezval@...il.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.18 127/158] thermal_hwmon: Sanitize attribute name passed to hwmon

4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Marc Zyngier <marc.zyngier@....com>

[ Upstream commit 409ef0bacacf72c51cc876349ae3fdf7cf726d47 ]

My Chromebook Plus (kevin) is spitting the following at boot time:

(NULL device *): hwmon: 'sbs-9-000b' is not a valid name attribute, please fix

Clearly, __hwmon_device_register is unhappy about the property name.
Some investigation reveals that thermal_add_hwmon_sysfs doesn't
sanitize the name of the attribute.

In order to keep it quiet, let's replace '-' with '_' in hwmon->type
This is consistent with what iio-hwmon does since b92fe9e3379c8.

Signed-off-by: Marc Zyngier <marc.zyngier@....com>
Tested-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
Signed-off-by: Eduardo Valentin <edubezval@...il.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/thermal/thermal_hwmon.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/thermal/thermal_hwmon.c
+++ b/drivers/thermal/thermal_hwmon.c
@@ -142,6 +142,7 @@ int thermal_add_hwmon_sysfs(struct therm
 
 	INIT_LIST_HEAD(&hwmon->tz_list);
 	strlcpy(hwmon->type, tz->type, THERMAL_NAME_LENGTH);
+	strreplace(hwmon->type, '-', '_');
 	hwmon->device = hwmon_device_register_with_info(NULL, hwmon->type,
 							hwmon, NULL, NULL);
 	if (IS_ERR(hwmon->device)) {