Commit d2583169 authored by Guenter Roeck's avatar Guenter Roeck Committed by Tong Tiangen
Browse files

hwmon: (w83627ehf) Fix underflows seen when writing limit attributes 

stable inclusion
from stable-v4.19.322
commit 93cf73a7bfdce683bde3a7bb65f270d3bd24497b
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/IARX5F
CVE: CVE-2024-46756

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=93cf73a7bfdce683bde3a7bb65f270d3bd24497b



--------------------------------

[ 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: default avatarGuenter Roeck <linux@roeck-us.net>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
Signed-off-by: default avatarTong Tiangen <tongtiangen@huawei.com>
parent 4c94bdfb

drivers/hwmon/w83627ehf.c

+2 −2
Original line number Diff line number Diff line
@@ -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) {