From: Pei Xiao xiaopei01@kylinos.cn

stable inclusion from stable-v6.6.64 commit 685c10269c41d23d7a2b85d3fd6b6345390c8746 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IBDHGY CVE: CVE-2024-53159

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

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[ Upstream commit 57ee12b6c514146c19b6a159013b48727a012960 ]

DIV_ROUND_CLOSEST() after kstrtoul() results in an overflow if a large number such as 18446744073709551615 is provided by the user. Fix it by reordering clamp_val() and DIV_ROUND_CLOSEST() operations.

Signed-off-by: Pei Xiao xiaopei01@kylinos.cn Fixes: c3963bc0a0cf ("hwmon: (nct6775) Split core and platform driver") Message-ID: 7d5084cea33f7c0fd0578c59adfff71f93de94d9.1731375425.git.xiaopei01@kylinos.cn Signed-off-by: Guenter Roeck linux@roeck-us.net Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Li Huafei lihuafei1@huawei.com --- drivers/hwmon/nct6775-core.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/hwmon/nct6775-core.c b/drivers/hwmon/nct6775-core.c index 8da7aa1614d7..16f6b7ba2a5d 100644 --- a/drivers/hwmon/nct6775-core.c +++ b/drivers/hwmon/nct6775-core.c @@ -2878,8 +2878,7 @@ store_target_temp(struct device *dev, struct device_attribute *attr, if (err < 0) return err;

- val = clamp_val(DIV_ROUND_CLOSEST(val, 1000), 0, - data->target_temp_mask); + val = DIV_ROUND_CLOSEST(clamp_val(val, 0, data->target_temp_mask * 1000), 1000);

mutex_lock(&data->update_lock); data->target_temp[nr] = val; @@ -2959,7 +2958,7 @@ store_temp_tolerance(struct device *dev, struct device_attribute *attr, return err;

/* Limit tolerance as needed */ - val = clamp_val(DIV_ROUND_CLOSEST(val, 1000), 0, data->tolerance_mask); + val = DIV_ROUND_CLOSEST(clamp_val(val, 0, data->tolerance_mask * 1000), 1000);

mutex_lock(&data->update_lock); data->temp_tolerance[index][nr] = val; @@ -3085,7 +3084,7 @@ store_weight_temp(struct device *dev, struct device_attribute *attr, if (err < 0) return err;

- val = clamp_val(DIV_ROUND_CLOSEST(val, 1000), 0, 255); + val = DIV_ROUND_CLOSEST(clamp_val(val, 0, 255000), 1000);

mutex_lock(&data->update_lock); data->weight_temp[index][nr] = val;