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Message-ID: <20240801002803.3935985-57-sashal@kernel.org>
Date: Wed, 31 Jul 2024 20:26:15 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Guenter Roeck <linux@...ck-us.net>,
	Sasha Levin <sashal@...nel.org>,
	jdelvare@...e.com,
	linux-hwmon@...r.kernel.org
Subject: [PATCH AUTOSEL 6.1 57/61] hwmon: (nct6775-core) Fix underflows seen when writing limit attributes

From: Guenter Roeck <linux@...ck-us.net>

[ Upstream commit 0403e10bf0824bf0ec2bb135d4cf1c0cc3bf4bf0 ]

DIV_ROUND_CLOSEST() after kstrtol() results in an underflow if a large
negative number such as -9223372036854775808 is provided by the user.
Fix it by reordering clamp_val() and DIV_ROUND_CLOSEST() operations.

Signed-off-by: Guenter Roeck <linux@...ck-us.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/hwmon/nct6775-core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/hwmon/nct6775-core.c b/drivers/hwmon/nct6775-core.c
index 9720ad214c20b..83e424945b598 100644
--- a/drivers/hwmon/nct6775-core.c
+++ b/drivers/hwmon/nct6775-core.c
@@ -2171,7 +2171,7 @@ store_temp_offset(struct device *dev, struct device_attribute *attr,
 	if (err < 0)
 		return err;
 
-	val = clamp_val(DIV_ROUND_CLOSEST(val, 1000), -128, 127);
+	val = DIV_ROUND_CLOSEST(clamp_val(val, -128000, 127000), 1000);
 
 	mutex_lock(&data->update_lock);
 	data->temp_offset[nr] = val;
-- 
2.43.0


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