[PATCH] SELinux: fix hard link count for selinuxfs root directory

A further fix is needed for selinuxfs link count management, to ensure that
the count is correct for the parent directory when a subdirectory is
created.  This is only required for the root directory currently, but the
code has been updated for the general case.

Signed-off-by: James Morris <jmorris@namei.org>
Acked-by: Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

security/selinux/selinuxfs.c

@@ -1166,12 +1166,12 @@ static int sel_make_avc_files(struct dentry *dir)
 	return ret;
 }
 
-static int sel_make_dir(struct super_block *sb, struct dentry *dentry)
+static int sel_make_dir(struct inode *dir, struct dentry *dentry)
 {
 	int ret = 0;
 	struct inode *inode;
 
-	inode = sel_make_inode(sb, S_IFDIR | S_IRUGO | S_IXUGO);
+	inode = sel_make_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO);
 	if (!inode) {
 		ret = -ENOMEM;
 		goto out;
@@ -1181,6 +1181,8 @@ static int sel_make_dir(struct super_block *sb, struct dentry *dentry)
 	/* directory inodes start off with i_nlink == 2 (for "." entry) */
 	inode->i_nlink++;
 	d_add(dentry, inode);
+	/* bump link count on parent directory, too */
+	dir->i_nlink++;
 out:
 	return ret;
 }
@@ -1189,7 +1191,7 @@ static int sel_fill_super(struct super_block * sb, void * data, int silent)
 {
 	int ret;
 	struct dentry *dentry;
-	struct inode *inode;
+	struct inode *inode, *root_inode;
 	struct inode_security_struct *isec;
 
 	static struct tree_descr selinux_files[] = {
@@ -1212,13 +1214,15 @@ static int sel_fill_super(struct super_block * sb, void * data, int silent)
 	if (ret)
 		goto err;
 
+	root_inode = sb->s_root->d_inode;
+
 	dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME);
 	if (!dentry) {
 		ret = -ENOMEM;
 		goto err;
 	}
 
-	ret = sel_make_dir(sb, dentry);
+	ret = sel_make_dir(root_inode, dentry);
 	if (ret)
 		goto err;
 
@@ -1250,7 +1254,7 @@ static int sel_fill_super(struct super_block * sb, void * data, int silent)
 		goto err;
 	}
 
-	ret = sel_make_dir(sb, dentry);
+	ret = sel_make_dir(root_inode, dentry);
 	if (ret)
 		goto err;