[CIFS] Fix CIFS readdir access denied when SE Linux enabled

CIFS had one path in which dentry was instantiated before the corresponding
inode metadata was filled in.

Fixes Redhat bugzilla bug #163493
Signed-off-by: Steve French <sfrench@us.ibm.com>
Acked-by: Eric Paris <eparis@redhat.com>
Acked-by: Dave Kleikamp <shaggy@austin.ibm.com>

fs/cifs/readdir.c

@@ -82,7 +82,6 @@ static int construct_dentry(struct qstr *qstring, struct file *file,
 			if(*ptmp_inode == NULL)
 				return rc;
 			rc = 1;
-			d_instantiate(tmp_dentry, *ptmp_inode);
 		}
 	} else {
 		tmp_dentry = d_alloc(file->f_dentry, qstring);
@@ -99,9 +98,7 @@ static int construct_dentry(struct qstr *qstring, struct file *file,
 			tmp_dentry->d_op = &cifs_dentry_ops;
 		if(*ptmp_inode == NULL)
 			return rc;
-		rc = 1;
-		d_instantiate(tmp_dentry, *ptmp_inode);
-		d_rehash(tmp_dentry);
+		rc = 2;
 	}
 
 	tmp_dentry->d_time = jiffies;
@@ -871,6 +868,12 @@ static int cifs_filldir(char *pfindEntry, struct file *file,
 	else
 		fill_in_inode(tmp_inode, 1 /* NT */, pfindEntry, &obj_type, rc);
 
+	if(rc) /* new inode - needs to be tied to dentry */ {
+		d_instantiate(tmp_dentry, tmp_inode);
+		if(rc == 2)
+			d_rehash(tmp_dentry);
+	}
+	
 	
 	rc = filldir(direntry,qstring.name,qstring.len,file->f_pos,
 		     tmp_inode->i_ino,obj_type);