Btrfs: add extra sanity checks on the path names in btrfs_mksubvol
Chris Mason [Tue, 21 Feb 2012 03:14:55 +0000 (22:14 -0500)]
Signed-off-by: Chris Mason <chris.mason@oracle.com>

fs/btrfs/ioctl.c

index e9bdb8b..05446f7 100644 (file)
@@ -1333,6 +1333,12 @@ static noinline int btrfs_ioctl_snap_create_transid(struct file *file,
                goto out;
        }
 
+       if (name[0] == '.' &&
+          (namelen == 1 || (name[1] == '.' && namelen == 2))) {
+               ret = -EEXIST;
+               goto out;
+       }
+
        if (subvol) {
                ret = btrfs_mksubvol(&file->f_path, name, namelen,
                                     NULL, transid, readonly);