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sysfs: use memdup_user()

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Remove open-coded memdup_user().

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Li Zefan 2009-04-08 15:07:30 +08:00 committed by Al Viro
parent dae7b665cf
commit 1c8542c7bb
1 changed files with 3 additions and 10 deletions
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13
fs/sysfs/bin.c
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@ -157,14 +157,9 @@ static ssize_t write(struct file *file, const char __user *userbuf,
count = size - offs;
}
temp = kmalloc(count, GFP_KERNEL);
if (!temp)
return -ENOMEM;
if (copy_from_user(temp, userbuf, count)) {
count = -EFAULT;
goto out_free;
}
temp = memdup_user(userbuf, count);
if (IS_ERR(temp))
return PTR_ERR(temp);
mutex_lock(&bb->mutex);
@ -176,8 +171,6 @@ static ssize_t write(struct file *file, const char __user *userbuf,
if (count > 0)
*off = offs + count;
out_free:
kfree(temp);
return count;
}