Btrfs: add extra sanity checks on the path names in btrfs_mksubvol

Signed-off-by: Chris Mason <chris.mason@oracle.com>
2012-02-20 22:14:55 -05:00 · 2012-02-20 22:14:55 -05:00 · 16780cabb8
parent a6b0d5c8db
commit 16780cabb8
1 changed files with 6 additions and 0 deletions
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@ -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);