linux-kernel - [PATCH AUTOSEL 4.18 091/131] thermal_hwmon: Sanitize attribute name passed to hwmon

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Message-ID: <20180902064601.183036-91-alexander.levin@microsoft.com>
Date:   Sun, 2 Sep 2018 13:04:59 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Marc Zyngier <marc.zyngier@....com>,
        Eduardo Valentin <edubezval@...il.com>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL 4.18 091/131] thermal_hwmon: Sanitize attribute name
 passed to hwmon

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>
---
 drivers/thermal/thermal_hwmon.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/thermal/thermal_hwmon.c b/drivers/thermal/thermal_hwmon.c
index 11278836ed12..0bd47007c57f 100644
--- a/drivers/thermal/thermal_hwmon.c
+++ b/drivers/thermal/thermal_hwmon.c
@@ -142,6 +142,7 @@ int thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
 
 	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)) {
-- 
2.17.1