6.6-stable review patch. If anyone has any objections, please let me know.
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From: Lifeng Zheng zhenglifeng1@huawei.com
[ 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.co... Signed-off-by: Chanwoo Choi cw00.choi@samsung.com Signed-off-by: Sasha Levin sashal@kernel.org --- 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);