From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933255Ab0EJXEj (ORCPT ); Mon, 10 May 2010 19:04:39 -0400 Received: from kroah.org ([198.145.64.141]:45371 "EHLO coco.kroah.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932938Ab0EJW6b (ORCPT ); Mon, 10 May 2010 18:58:31 -0400 X-Mailbox-Line: From gregkh@kvm.kroah.org Mon May 10 15:35:41 2010 Message-Id: <20100510223541.776043632@kvm.kroah.org> User-Agent: quilt/0.48-4.4 Date: Mon, 10 May 2010 15:35:34 -0700 From: Greg KH To: linux-kernel@vger.kernel.org, stable@kernel.org Cc: stable-review@kernel.org, torvalds@linux-foundation.org, akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk, Dan Carpenter , James Morris Subject: [82/98] security: testing the wrong variable in create_by_name() In-Reply-To: <20100510223714.GA18416@kroah.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 2.6.32-stable review patch. If anyone has any objections, please let us know. ------------------ From: Dan Carpenter commit b338cc8207eae46640a8d534738fda7b5e48511d upstream. There is a typo here. We should be testing "*dentry" instead of "dentry". If "*dentry" is an ERR_PTR, it gets dereferenced in either mkdir() or create() which would cause an OOPs. Signed-off-by: Dan Carpenter Signed-off-by: James Morris Signed-off-by: Greg Kroah-Hartman --- security/inode.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/security/inode.c +++ b/security/inode.c @@ -168,13 +168,13 @@ static int create_by_name(const char *na mutex_lock(&parent->d_inode->i_mutex); *dentry = lookup_one_len(name, parent, strlen(name)); - if (!IS_ERR(dentry)) { + if (!IS_ERR(*dentry)) { if ((mode & S_IFMT) == S_IFDIR) error = mkdir(parent->d_inode, *dentry, mode); else error = create(parent->d_inode, *dentry, mode); } else - error = PTR_ERR(dentry); + error = PTR_ERR(*dentry); mutex_unlock(&parent->d_inode->i_mutex); return error;