From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932799Ab3BYWWx (ORCPT ); Mon, 25 Feb 2013 17:22:53 -0500 Received: from mail.linuxfoundation.org ([140.211.169.12]:55286 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932599Ab3BYWUb (ORCPT ); Mon, 25 Feb 2013 17:20:31 -0500 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Bob Peterson , Steven Whitehouse Subject: [ 51/58] GFS2: Get a block reservation before resizing a file Date: Mon, 25 Feb 2013 14:19:47 -0800 Message-Id: <20130225221647.137610334@linuxfoundation.org> X-Mailer: git-send-email 1.8.1.rc1.5.g7e0651a In-Reply-To: <20130225221636.018756060@linuxfoundation.org> References: <20130225221636.018756060@linuxfoundation.org> User-Agent: quilt/0.60-2.1.2 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.7-stable review patch. If anyone has any objections, please let me know. ------------------ From: Bob Peterson commit d2b47cfb26fe06002b8011707baac71a9ae8166f upstream. This patch allocates a block reservation structure before growing or shrinking a file. Without this structure, the grow or shink code can reference the bad pointer. Signed-off-by: Bob Peterson Signed-off-by: Steven Whitehouse Signed-off-by: Greg Kroah-Hartman --- fs/gfs2/bmap.c | 4 ++++ 1 file changed, 4 insertions(+) --- a/fs/gfs2/bmap.c +++ b/fs/gfs2/bmap.c @@ -1240,6 +1240,10 @@ int gfs2_setattr_size(struct inode *inod inode_dio_wait(inode); + ret = gfs2_rs_alloc(GFS2_I(inode)); + if (ret) + return ret; + oldsize = inode->i_size; if (newsize >= oldsize) return do_grow(inode, newsize);