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mt76: mt7915: fix hwmon temp sensor mem use-after-free

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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: 33fe9c639c ("mt76: mt7915: add thermal sensor device support")
Signed-off-by: Ben Greear <greearb@candelatech.com>
Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Ben Greear 2021-09-02 13:52:03 +08:00 committed by Felix Fietkau
parent 68ee6a14fe
commit 0ae3ff5684
1 changed files with 6 additions and 4 deletions
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10
drivers/net/wireless/mediatek/mt76/mt7915/init.c
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@ -160,9 +160,12 @@ 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)
@ -174,8 +177,7 @@ 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);