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PM / devfreq: governor: Replace sscanf() with kstrtoul() in set_freq_store()

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[ Upstream commit 914cc799b28f17d369d5b4db3b941957d18157e8 ]

Replace sscanf() with kstrtoul() in set_freq_store() and check the result
to avoid invalid input.

Signed-off-by: Lifeng Zheng <zhenglifeng1@huawei.com>
Link: https://lore.kernel.org/lkml/20250421030020.3108405-2-zhenglifeng1@huawei.com/
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Lifeng Zheng
2025-04-21 11:00:17 +08:00
committed by Greg Kroah-Hartman
parent 888a453c2a
commit 9c83bf68a5
1 changed files with 5 additions and 1 deletions
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6
drivers/devfreq/governor_userspace.c
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@@ -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 store_freq(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);