1 files changed, 6 insertions, 12 deletions

diff --git a/fs/autofs4/dev-ioctl.c b/fs/autofs4/dev-ioctl.c
index d29b7f6df862..ba4a38b9c22f 100644
--- a/fs/autofs4/dev-ioctl.c
+++ b/fs/autofs4/dev-ioctl.c
@@ -95,7 +95,7 @@ static int check_dev_ioctl_version(int cmd, struct autofs_dev_ioctl *param)
  */
 static struct autofs_dev_ioctl *copy_dev_ioctl(struct autofs_dev_ioctl __user *in)
 {
-        struct autofs_dev_ioctl tmp, *ads;
+        struct autofs_dev_ioctl tmp;
 
         if (copy_from_user(&tmp, in, sizeof(tmp)))
                 return ERR_PTR(-EFAULT);
@@ -103,16 +103,7 @@ static struct autofs_dev_ioctl *copy_dev_ioctl(struct autofs_dev_ioctl __user *i
         if (tmp.size < sizeof(tmp))
                 return ERR_PTR(-EINVAL);
 
-        ads = kmalloc(tmp.size, GFP_KERNEL);
-        if (!ads)
-                return ERR_PTR(-ENOMEM);
-
-        if (copy_from_user(ads, in, tmp.size)) {
-                kfree(ads);
-                return ERR_PTR(-EFAULT);
-        }
-
-        return ads;
+        return memdup_user(in, tmp.size);
 }
 
 static inline void free_dev_ioctl(struct autofs_dev_ioctl *param)
@@ -736,11 +727,14 @@ static const struct file_operations _dev_ioctl_fops = {
 };
 
 static struct miscdevice _autofs_dev_ioctl_misc = {
-        .minor          = MISC_DYNAMIC_MINOR,
+        .minor          = AUTOFS_MINOR,
         .name           = AUTOFS_DEVICE_NAME,
         .fops           = &_dev_ioctl_fops
 };
 
+MODULE_ALIAS_MISCDEV(AUTOFS_MINOR);
+MODULE_ALIAS("devname:autofs");
+
 /* Register/deregister misc character device */
 int autofs_dev_ioctl_init(void)
 {