From: Lifeng Zheng <zhenglifeng1@huawei.com> driver inclusion category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/ICD4AE ----------------------------------------------- Replace sscanf() with kstrtoul() in set_freq_store() and check the result to avoid invalid input. Signed-off-by: Lifeng Zheng <zhenglifeng1@huawei.com> Signed-off-by: Jie Zhan <zhanjie9@hisilicon.com> --- drivers/devfreq/governor_userspace.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/devfreq/governor_userspace.c b/drivers/devfreq/governor_userspace.c index d69672ccacc4..8d057cea09d5 100644 --- a/drivers/devfreq/governor_userspace.c +++ b/drivers/devfreq/governor_userspace.c @@ -9,6 +9,7 @@ #include <linux/slab.h> #include <linux/device.h> #include <linux/devfreq.h> +#include <linux/kstrtox.h> #include <linux/pm.h> #include <linux/mutex.h> #include <linux/module.h> @@ -39,10 +40,13 @@ static ssize_t set_freq_store(struct device *dev, struct device_attribute *attr, unsigned long wanted; int err = 0; + err = kstrtoul(buf, 0, &wanted); + if (err) + return err; + mutex_lock(&devfreq->lock); data = devfreq->governor_data; - sscanf(buf, "%lu", &wanted); data->user_frequency = wanted; data->valid = true; err = update_devfreq(devfreq); -- 2.33.0