From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758919AbYC1Omi (ORCPT ); Fri, 28 Mar 2008 10:42:38 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756640AbYC1Ofq (ORCPT ); Fri, 28 Mar 2008 10:35:46 -0400 Received: from mx1.redhat.com ([66.187.233.31]:49295 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755653AbYC1Oeu (ORCPT ); Fri, 28 Mar 2008 10:34:50 -0400 Organization: Red Hat UK Ltd. Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903 From: David Howells Subject: [PATCH 27/45] AFS: prevent double cell registration [ver #35] To: torvalds@osdl.org, akpm@linux-foundation.org, trond.myklebust@fys.uio.no, chuck.lever@oracle.com Cc: nfsv4@linux-nfs.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, selinux@tycho.nsa.gov, linux-security-module@vger.kernel.org, dhowells@redhat.com Date: Fri, 28 Mar 2008 14:32:29 +0000 Message-ID: <20080328143229.3483.92808.stgit@warthog.procyon.org.uk> In-Reply-To: <20080328143010.3483.99079.stgit@warthog.procyon.org.uk> References: <20080328143010.3483.99079.stgit@warthog.procyon.org.uk> User-Agent: StGIT/0.14.1 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Sven Schnelle kafs doesn't check if the cell already exists - so if you do an echo "add newcell.org 1.2.3.4" >/proc/fs/afs/cells it will try to create this cell again. kobject will also complain about a double registration. To prevent such problems, return -EEXIST in that case. Signed-off-by: Sven Schnelle Signed-off-by: David Howells --- fs/afs/cell.c | 15 +++++++++++++-- 1 files changed, 13 insertions(+), 2 deletions(-) diff --git a/fs/afs/cell.c b/fs/afs/cell.c index 970d38f..788865d 100644 --- a/fs/afs/cell.c +++ b/fs/afs/cell.c @@ -127,14 +127,20 @@ struct afs_cell *afs_cell_create(const char *name, char *vllist) _enter("%s,%s", name, vllist); + down_write(&afs_cells_sem); + read_lock(&afs_cells_lock); + list_for_each_entry(cell, &afs_cells, link) { + if (strcasecmp(cell->name, name) == 0) + goto duplicate_name; + } + read_unlock(&afs_cells_lock); + cell = afs_cell_alloc(name, vllist); if (IS_ERR(cell)) { _leave(" = %ld", PTR_ERR(cell)); return cell; } - down_write(&afs_cells_sem); - /* add a proc directory for this cell */ ret = afs_proc_cell_setup(cell); if (ret < 0) @@ -167,6 +173,11 @@ error: kfree(cell); _leave(" = %d", ret); return ERR_PTR(ret); + +duplicate_name: + read_unlock(&afs_cells_lock); + up_write(&afs_cells_sem); + return ERR_PTR(-EEXIST); } /*