ecryptfs: 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, 5 insertions, 10 deletions

diff --git a/fs/ecryptfs/miscdev.c b/fs/ecryptfs/miscdev.c
index a67fea655f49..dda3c58eefc0 100644
--- a/fs/ecryptfs/miscdev.c
+++ b/fs/ecryptfs/miscdev.c
@@ -418,18 +418,13 @@ ecryptfs_miscdev_write(struct file *file, const char __user *buf,
 
         if (count == 0)
                 goto out;
-        data = kmalloc(count, GFP_KERNEL);
-        if (!data) {
-                printk(KERN_ERR "%s: Out of memory whilst attempting to "
-                       "kmalloc([%zd], GFP_KERNEL)\n", __func__, count);
+
+        data = memdup_user(buf, count);
+        if (IS_ERR(data)) {
+                printk(KERN_ERR "%s: memdup_user returned error [%ld]\n",
+                       __func__, PTR_ERR(data));
                 goto out;
         }
-        rc = copy_from_user(data, buf, count);
-        if (rc) {
-                printk(KERN_ERR "%s: copy_from_user returned error [%d]\n",
-                       __func__, rc);
-                goto out_free;
-        }
         sz = count;
         i = 0;
         switch (data[i++]) {