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git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
PM / devfreq: governor: Replace sscanf() with kstrtoul() in set_freq_store()
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>
authored by
Lifeng Zheng
and committed by
Chanwoo Choi
914cc799
347e9f50
+5
-1
+5
-1
drivers/devfreq/governor_userspace.c
+5
-1
drivers/devfreq/governor_userspace.c
···
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#include <linux/slab.h>
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#include <linux/device.h>
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#include <linux/devfreq.h>
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#include <linux/kstrtox.h>
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#include <linux/pm.h>
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#include <linux/mutex.h>
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#include <linux/module.h>
···
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unsigned long wanted;
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int err = 0;
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err = kstrtoul(buf, 0, &wanted);
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if (err)
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return err;
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mutex_lock(&devfreq->lock);
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data = devfreq->governor_data;
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sscanf(buf, "%lu", &wanted);
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data->user_frequency = wanted;
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data->valid = true;
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err = update_devfreq(devfreq);