linux-kernel - [PATCH AUTOSEL 4.19 13/14] hwmon: (w83627ehf) Fix underflows seen when writing limit attributes

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Message-ID: <20240801004037.3939932-13-sashal@kernel.org>
Date: Wed, 31 Jul 2024 20:40:21 -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 4.19 13/14] hwmon: (w83627ehf) Fix underflows seen when writing limit attributes

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

[ Upstream commit 5c1de37969b7bc0abcb20b86e91e70caebbd4f89 ]

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/w83627ehf.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/hwmon/w83627ehf.c b/drivers/hwmon/w83627ehf.c
index ad68b6d9ff17e..8da5f77b8987c 100644
--- a/drivers/hwmon/w83627ehf.c
+++ b/drivers/hwmon/w83627ehf.c
@@ -1519,7 +1519,7 @@ store_target_temp(struct device *dev, struct device_attribute *attr,
 	if (err < 0)
 		return err;
 
-	val = clamp_val(DIV_ROUND_CLOSEST(val, 1000), 0, 127);
+	val = DIV_ROUND_CLOSEST(clamp_val(val, 0, 127000), 1000);
 
 	mutex_lock(&data->update_lock);
 	data->target_temp[nr] = val;
@@ -1545,7 +1545,7 @@ store_tolerance(struct device *dev, struct device_attribute *attr,
 		return err;
 
 	/* Limit the temp to 0C - 15C */
-	val = clamp_val(DIV_ROUND_CLOSEST(val, 1000), 0, 15);
+	val = DIV_ROUND_CLOSEST(clamp_val(val, 0, 15000), 1000);
 
 	mutex_lock(&data->update_lock);
 	if (sio_data->kind == nct6775 || sio_data->kind == nct6776) {
-- 
2.43.0