1 files changed, 18 insertions, 40 deletions

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 7594bec1be10..5e94ea6e1cbe 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -461,15 +461,9 @@ static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg)
         if (!capable(CAP_SYS_ADMIN))
                 return -EPERM;
 
-        vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
-
-        if (!vol_args)
-                return -ENOMEM;
-
-        if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
-                ret = -EFAULT;
-                goto out;
-        }
+        vol_args = memdup_user(arg, sizeof(*vol_args));
+        if (IS_ERR(vol_args))
+                return PTR_ERR(vol_args);
 
         vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
         namelen = strlen(vol_args->name);
@@ -483,11 +477,13 @@ static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg)
                 *devstr = '\0';
                 devstr = vol_args->name;
                 devid = simple_strtoull(devstr, &end, 10);
-                printk(KERN_INFO "resizing devid %llu\n", devid);
+                printk(KERN_INFO "resizing devid %llu\n",
+                       (unsigned long long)devid);
         }
         device = btrfs_find_device(root, devid, NULL, NULL);
         if (!device) {
-                printk(KERN_INFO "resizer unable to find device %llu\n", devid);
+                printk(KERN_INFO "resizer unable to find device %llu\n",
+                       (unsigned long long)devid);
                 ret = -EINVAL;
                 goto out_unlock;
         }
@@ -545,7 +541,6 @@ static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg)
 
 out_unlock:
         mutex_unlock(&root->fs_info->volume_mutex);
-out:
         kfree(vol_args);
         return ret;
 }
@@ -565,15 +560,9 @@ static noinline int btrfs_ioctl_snap_create(struct file *file,
         if (root->fs_info->sb->s_flags & MS_RDONLY)
                 return -EROFS;
 
-        vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
-
-        if (!vol_args)
-                return -ENOMEM;
-
-        if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
-                ret = -EFAULT;
-                goto out;
-        }
+        vol_args = memdup_user(arg, sizeof(*vol_args));
+        if (IS_ERR(vol_args))
+                return PTR_ERR(vol_args);
 
         vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
         namelen = strlen(vol_args->name);
@@ -675,19 +664,13 @@ static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg)
         if (!capable(CAP_SYS_ADMIN))
                 return -EPERM;
 
-        vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
+        vol_args = memdup_user(arg, sizeof(*vol_args));
+        if (IS_ERR(vol_args))
+                return PTR_ERR(vol_args);
 
-        if (!vol_args)
-                return -ENOMEM;
-
-        if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
-                ret = -EFAULT;
-                goto out;
-        }
         vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
         ret = btrfs_init_new_device(root, vol_args->name);
 
-out:
         kfree(vol_args);
         return ret;
 }
@@ -703,19 +686,13 @@ static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg)
         if (root->fs_info->sb->s_flags & MS_RDONLY)
                 return -EROFS;
 
-        vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
+        vol_args = memdup_user(arg, sizeof(*vol_args));
+        if (IS_ERR(vol_args))
+                return PTR_ERR(vol_args);
 
-        if (!vol_args)
-                return -ENOMEM;
-
-        if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
-                ret = -EFAULT;
-                goto out;
-        }
         vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
         ret = btrfs_rm_device(root, vol_args->name);
 
-out:
         kfree(vol_args);
         return ret;
 }
@@ -830,7 +807,8 @@ static long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
         BUG_ON(!trans);
 
         /* punch hole in destination first */
-        btrfs_drop_extents(trans, root, inode, off, off+len, 0, &hint_byte);
+        btrfs_drop_extents(trans, root, inode, off, off + len,
+                           off + len, 0, &hint_byte);
 
         /* clone data */
         key.objectid = src->i_ino;