From patchwork Fri Jul 29 21:38:19 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sachin Prabhu X-Patchwork-Id: 9252823 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 5E2A96075F for ; Fri, 29 Jul 2016 21:38:31 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4EC1C28409 for ; Fri, 29 Jul 2016 21:38:31 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 422BC2842B; Fri, 29 Jul 2016 21:38:31 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id D6A6D28409 for ; Fri, 29 Jul 2016 21:38:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753289AbcG2Via (ORCPT ); Fri, 29 Jul 2016 17:38:30 -0400 Received: from mx1.redhat.com ([209.132.183.28]:38786 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752609AbcG2Via (ORCPT ); Fri, 29 Jul 2016 17:38:30 -0400 Received: from int-mx14.intmail.prod.int.phx2.redhat.com (int-mx14.intmail.prod.int.phx2.redhat.com [10.5.11.27]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id AA5B3C057FA9; Fri, 29 Jul 2016 21:38:29 +0000 (UTC) Received: from sprabhu-lp.redhat.com (ovpn-116-27.ams2.redhat.com [10.36.116.27]) by int-mx14.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u6TLcN7q004901 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Fri, 29 Jul 2016 17:38:27 -0400 From: Sachin Prabhu To: linux-cifs Cc: Steve French , =?UTF-8?q?Aur=C3=A9lien=20Aptel?= , Pavel Shilovsky Subject: [PATCH 1/3] Fix memory leaks in cifs_do_mount() Date: Fri, 29 Jul 2016 22:38:19 +0100 Message-Id: <1469828301-9937-2-git-send-email-sprabhu@redhat.com> In-Reply-To: <1469828301-9937-1-git-send-email-sprabhu@redhat.com> References: <1469828301-9937-1-git-send-email-sprabhu@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.27 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.32]); Fri, 29 Jul 2016 21:38:29 +0000 (UTC) Sender: linux-cifs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-cifs@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Fix memory leaks introduced by the patch fs/cifs: make share unaccessible at root level mountable Also move allocation of cifs_sb->prepath to cifs_setup_cifs_sb(). Signed-off-by: Sachin Prabhu --- fs/cifs/cifsfs.c | 20 ++++++++------------ fs/cifs/cifsproto.h | 2 +- fs/cifs/connect.c | 10 +++++++++- 3 files changed, 18 insertions(+), 14 deletions(-) diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c index 6bbec5e..cc9cdab 100644 --- a/fs/cifs/cifsfs.c +++ b/fs/cifs/cifsfs.c @@ -686,26 +686,22 @@ cifs_do_mount(struct file_system_type *fs_type, cifs_sb->mountdata = kstrndup(data, PAGE_SIZE, GFP_KERNEL); if (cifs_sb->mountdata == NULL) { root = ERR_PTR(-ENOMEM); - goto out_cifs_sb; + goto out_free; } - if (volume_info->prepath) { - cifs_sb->prepath = kstrdup(volume_info->prepath, GFP_KERNEL); - if (cifs_sb->prepath == NULL) { - root = ERR_PTR(-ENOMEM); - goto out_cifs_sb; - } + rc = cifs_setup_cifs_sb(volume_info, cifs_sb); + if (rc) { + root = ERR_PTR(rc); + goto out_free; } - cifs_setup_cifs_sb(volume_info, cifs_sb); - rc = cifs_mount(cifs_sb, volume_info); if (rc) { if (!(flags & MS_SILENT)) cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n", rc); root = ERR_PTR(rc); - goto out_mountdata; + goto out_free; } mnt_data.vol = volume_info; @@ -752,9 +748,9 @@ out: cifs_cleanup_volume_info(volume_info); return root; -out_mountdata: +out_free: + kfree(cifs_sb->prepath); kfree(cifs_sb->mountdata); -out_cifs_sb: kfree(cifs_sb); out_nls: unload_nls(volume_info->local_nls); diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h index 1243bd3..95dab43 100644 --- a/fs/cifs/cifsproto.h +++ b/fs/cifs/cifsproto.h @@ -184,7 +184,7 @@ extern int cifs_read_from_socket(struct TCP_Server_Info *server, char *buf, unsigned int to_read); extern int cifs_read_page_from_socket(struct TCP_Server_Info *server, struct page *page, unsigned int to_read); -extern void cifs_setup_cifs_sb(struct smb_vol *pvolume_info, +extern int cifs_setup_cifs_sb(struct smb_vol *pvolume_info, struct cifs_sb_info *cifs_sb); extern int cifs_match_super(struct super_block *, void *); extern void cifs_cleanup_volume_info(struct smb_vol *pvolume_info); diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c index 7ae0328..4546926 100644 --- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -3222,7 +3222,7 @@ void reset_cifs_unix_caps(unsigned int xid, struct cifs_tcon *tcon, } } -void cifs_setup_cifs_sb(struct smb_vol *pvolume_info, +int cifs_setup_cifs_sb(struct smb_vol *pvolume_info, struct cifs_sb_info *cifs_sb) { INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks); @@ -3316,6 +3316,14 @@ void cifs_setup_cifs_sb(struct smb_vol *pvolume_info, if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm)) cifs_dbg(VFS, "mount option dynperm ignored if cifsacl mount option supported\n"); + + if (pvolume_info->prepath) { + cifs_sb->prepath = kstrdup(pvolume_info->prepath, GFP_KERNEL); + if (cifs_sb->prepath == NULL) + return -ENOMEM; + } + + return 0; } static void