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>

1 files changed, 3 insertions, 10 deletions

diff --git a/fs/sysfs/bin.c b/fs/sysfs/bin.c
index 93e0c0281d45..9345806c8853 100644
--- a/fs/sysfs/bin.c
+++ b/fs/sysfs/bin.c
@@ -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;
 }