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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Stefan Mavrodiev <stefan@olimex.com>,
        Zhang Rui <rui.zhang@intel.com>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.19 066/114] thermal_hwmon: Sanitize thermal_zone type
Date:   Thu, 10 Oct 2019 10:36:13 +0200
Message-Id: <20191010083610.525336156@linuxfoundation.org>
In-Reply-To: <20191010083544.711104709@linuxfoundation.org>
References: <20191010083544.711104709@linuxfoundation.org>
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From: Stefan Mavrodiev <stefan@olimex.com>

[ Upstream commit 8c7aa184281c01fc26f319059efb94725012921d ]

When calling thermal_add_hwmon_sysfs(), the device type is sanitized by
replacing '-' with '_'. However tz->type remains unsanitized. Thus
calling thermal_hwmon_lookup_by_type() returns no device. And if there is
no device, thermal_remove_hwmon_sysfs() fails with "hwmon device lookup
failed!".

The result is unregisted hwmon devices in the sysfs.

Fixes: 409ef0bacacf ("thermal_hwmon: Sanitize attribute name passed to hwmon")

Signed-off-by: Stefan Mavrodiev <stefan@olimex.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/thermal/thermal_hwmon.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/thermal/thermal_hwmon.c b/drivers/thermal/thermal_hwmon.c
index 40c69a533b240..dd5d8ee379287 100644
--- a/drivers/thermal/thermal_hwmon.c
+++ b/drivers/thermal/thermal_hwmon.c
@@ -87,13 +87,17 @@ static struct thermal_hwmon_device *
 thermal_hwmon_lookup_by_type(const struct thermal_zone_device *tz)
 {
 	struct thermal_hwmon_device *hwmon;
+	char type[THERMAL_NAME_LENGTH];
 
 	mutex_lock(&thermal_hwmon_list_lock);
-	list_for_each_entry(hwmon, &thermal_hwmon_list, node)
-		if (!strcmp(hwmon->type, tz->type)) {
+	list_for_each_entry(hwmon, &thermal_hwmon_list, node) {
+		strcpy(type, tz->type);
+		strreplace(type, '-', '_');
+		if (!strcmp(hwmon->type, type)) {
 			mutex_unlock(&thermal_hwmon_list_lock);
 			return hwmon;
 		}
+	}
 	mutex_unlock(&thermal_hwmon_list_lock);
 
 	return NULL;
-- 
2.20.1