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sysfs: use memdup_user()
Remove open-coded memdup_user(). Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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@ -157,14 +157,9 @@ static ssize_t write(struct file *file, const char __user *userbuf,
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count = size - offs;
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}
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temp = kmalloc(count, GFP_KERNEL);
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if (!temp)
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return -ENOMEM;
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if (copy_from_user(temp, userbuf, count)) {
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count = -EFAULT;
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goto out_free;
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}
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temp = memdup_user(userbuf, count);
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if (IS_ERR(temp))
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return PTR_ERR(temp);
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mutex_lock(&bb->mutex);
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@ -176,8 +171,6 @@ static ssize_t write(struct file *file, const char __user *userbuf,
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if (count > 0)
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*off = offs + count;
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out_free:
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kfree(temp);
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return count;
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}
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