From: Chris Mason <chris.mason@oracle.com>
Date: Tue, 21 Feb 2012 03:14:55 +0000 (-0500)
Subject: Btrfs: add extra sanity checks on the path names in btrfs_mksubvol
X-Git-Tag: v2.6.39-400.9.0~607^2
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=370b122601ddb4585671cdb4e7dd26bc17abd6c0;p=users%2Fjedix%2Flinux-maple.git

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

Signed-off-by: Chris Mason <chris.mason@oracle.com>
---

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index d3bd1db41e67..471e805ed3f9 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -1327,6 +1327,12 @@ 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);