btrfs: use memdup_user()

[pandora-kernel.git] / fs / btrfs / ioctl.c

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 7594bec..9f135e8 100644 (file)
--- 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);
@@ -545,7 +539,6 @@ 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 +558,9 @@ 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 +662,13 @@ 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 +684,13 @@ 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;
 }