btrfs: check link counter overflow in link(2)
authorAl Viro <viro@ZenIV.linux.org.uk>
Fri, 4 Mar 2011 17:15:18 +0000 (17:15 +0000)
committerroot <Chris Mason chris.mason@oracle.com>
Mon, 28 Mar 2011 09:37:56 +0000 (05:37 -0400)
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
fs/btrfs/inode.c

index 4822b31..04babaf 100644 (file)
@@ -4837,6 +4837,9 @@ static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
        if (root->objectid != BTRFS_I(inode)->root->objectid)
                return -EXDEV;
 
+       if (inode->i_nlink == ~0U)
+               return -EMLINK;
+
        btrfs_inc_nlink(inode);
        inode->i_ctime = CURRENT_TIME;