linux-kernel - [PATCH 5.14 468/849] mt76: mt7915: fix hwmon temp sensor mem use-after-free

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Message-Id: <20211115165436.115466522@linuxfoundation.org>
Date:   Mon, 15 Nov 2021 17:59:11 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Ben Greear <greearb@...delatech.com>,
        Ryder Lee <ryder.lee@...iatek.com>,
        Felix Fietkau <nbd@....name>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.14 468/849] mt76: mt7915: fix hwmon temp sensor mem use-after-free

From: Ben Greear <greearb@...delatech.com>

[ Upstream commit 0ae3ff5684514d72357240f1033a7494c51f93ed ]

Without this change, garbage is seen in the hwmon name and sensors output
for mt7915 is garbled. It appears that the hwmon logic does not make a
copy of the incoming string, but instead just copies a char* and expects
it to never go away.

Fixes: 33fe9c639c13 ("mt76: mt7915: add thermal sensor device support")
Signed-off-by: Ben Greear <greearb@...delatech.com>
Signed-off-by: Ryder Lee <ryder.lee@...iatek.com>
Signed-off-by: Felix Fietkau <nbd@....name>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/wireless/mediatek/mt76/mt7915/init.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/init.c b/drivers/net/wireless/mediatek/mt76/mt7915/init.c
index 4798d6344305d..b171027e0cfa8 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/init.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/init.c
@@ -130,9 +130,12 @@ static int mt7915_thermal_init(struct mt7915_phy *phy)
 	struct wiphy *wiphy = phy->mt76->hw->wiphy;
 	struct thermal_cooling_device *cdev;
 	struct device *hwmon;
+	const char *name;
 
-	cdev = thermal_cooling_device_register(wiphy_name(wiphy), phy,
-					       &mt7915_thermal_ops);
+	name = devm_kasprintf(&wiphy->dev, GFP_KERNEL, "mt7915_%s",
+			      wiphy_name(wiphy));
+
+	cdev = thermal_cooling_device_register(name, phy, &mt7915_thermal_ops);
 	if (!IS_ERR(cdev)) {
 		if (sysfs_create_link(&wiphy->dev.kobj, &cdev->device.kobj,
 				      "cooling_device") < 0)
@@ -144,8 +147,7 @@ static int mt7915_thermal_init(struct mt7915_phy *phy)
 	if (!IS_REACHABLE(CONFIG_HWMON))
 		return 0;
 
-	hwmon = devm_hwmon_device_register_with_groups(&wiphy->dev,
-						       wiphy_name(wiphy), phy,
+	hwmon = devm_hwmon_device_register_with_groups(&wiphy->dev, name, phy,
 						       mt7915_hwmon_groups);
 	if (IS_ERR(hwmon))
 		return PTR_ERR(hwmon);
-- 
2.33.0