From: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
[ Upstream commit 5cdc45ed3948042f0d73c6fec5ee9b59e637d0d2 ]
First of all, unsigned long can overflow u32 value on 64-bit machine.
Second, simple_strtoul() doesn't check for overflow in the input.
Convert simple_strtoul() to kstrtou32() to eliminate above issues.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/platform/x86/hp-wmi.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/platform/x86/hp-wmi.c b/drivers/platform/x86/hp-wmi.c
index 06a3c1ef8eee..952544ca0d84 100644
--- a/drivers/platform/x86/hp-wmi.c
+++ b/drivers/platform/x86/hp-wmi.c
@@ -474,8 +474,14 @@ static ssize_t postcode_show(struct device *dev, struct device_attribute *attr,
static ssize_t als_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
- u32 tmp = simple_strtoul(buf, NULL, 10);
- int ret = hp_wmi_perform_query(HPWMI_ALS_QUERY, HPWMI_WRITE, &tmp,
+ u32 tmp;
+ int ret;
+
+ ret = kstrtou32(buf, 10, &tmp);
+ if (ret)
+ return ret;
+
+ ret = hp_wmi_perform_query(HPWMI_ALS_QUERY, HPWMI_WRITE, &tmp,
sizeof(tmp), sizeof(tmp));
if (ret)
return ret < 0 ? ret : -EINVAL;
--
2.25.1
