devm_kasprintf() can return a NULL pointer on failure but this returned
value is not checked. Fix this lack and check the returned value.

Found by code review.

Cc: stable@vger.kernel.org
Fixes: 0bb4e9187ea4 ("mt76: mt7615: fix hwmon temp sensor mem use-after-free")
Signed-off-by: Ma Ke <make24@iscas.ac.cn>
---
 drivers/net/wireless/mediatek/mt76/mt7615/init.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/init.c b/drivers/net/wireless/mediatek/mt76/mt7615/init.c
index f7722f67db57..0b9ebdcda221 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7615/init.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7615/init.c
@@ -56,6 +56,9 @@ int mt7615_thermal_init(struct mt7615_dev *dev)
 
 	name = devm_kasprintf(&wiphy->dev, GFP_KERNEL, "mt7615_%s",
 			      wiphy_name(wiphy));
+	if (!name)
+		return -ENOMEM;
+
 	hwmon = devm_hwmon_device_register_with_groups(&wiphy->dev, name, dev,
 						       mt7615_hwmon_groups);
 	return PTR_ERR_OR_ZERO(hwmon);
-- 
2.25.1

On 05/09/2024 03:47, Ma Ke wrote:
> devm_kasprintf() can return a NULL pointer on failure but this returned
> value is not checked. Fix this lack and check the returned value.
> 
> Found by code review.
> 
> Cc: stable@vger.kernel.org
> Fixes: 0bb4e9187ea4 ("mt76: mt7615: fix hwmon temp sensor mem use-after-free")
> Signed-off-by: Ma Ke <make24@iscas.ac.cn>

Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>

If you find more problems of that sort in the mediatek wireless drivers, I think 
a better approach would be to send them all as one patch.

> ---
>   drivers/net/wireless/mediatek/mt76/mt7615/init.c | 3 +++
>   1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/init.c b/drivers/net/wireless/mediatek/mt76/mt7615/init.c
> index f7722f67db57..0b9ebdcda221 100644
> --- a/drivers/net/wireless/mediatek/mt76/mt7615/init.c
> +++ b/drivers/net/wireless/mediatek/mt76/mt7615/init.c
> @@ -56,6 +56,9 @@ int mt7615_thermal_init(struct mt7615_dev *dev)
>   
>   	name = devm_kasprintf(&wiphy->dev, GFP_KERNEL, "mt7615_%s",
>   			      wiphy_name(wiphy));
> +	if (!name)
> +		return -ENOMEM;
> +
>   	hwmon = devm_hwmon_device_register_with_groups(&wiphy->dev, name, dev,
>   						       mt7615_hwmon_groups);
>   	return PTR_ERR_OR_ZERO(hwmon);