From patchwork Wed Mar 20 12:48:18 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Monakhov X-Patchwork-Id: 229377 Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 692722C00B7 for ; Wed, 20 Mar 2013 23:49:23 +1100 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934296Ab3CTMtS (ORCPT ); Wed, 20 Mar 2013 08:49:18 -0400 Received: from mailhub.sw.ru ([195.214.232.25]:1251 "EHLO relay.sw.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932576Ab3CTMtR (ORCPT ); Wed, 20 Mar 2013 08:49:17 -0400 Received: from mct-mail.qa.sw.ru ([10.29.1.112]) by relay.sw.ru (8.13.4/8.13.4) with ESMTP id r2KCmLZ7026337; Wed, 20 Mar 2013 16:48:25 +0400 (MSK) From: Dmitry Monakhov To: linux-ext4@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org, viro@ZenIV.linux.org.uk, jack@suse.cz, Dmitry Monakhov Subject: [PATCH 2/2] fs: prevent null pointer dereference for fs-less devices Date: Wed, 20 Mar 2013 16:48:18 +0400 Message-Id: <1363783698-28092-2-git-send-email-dmonakhov@openvz.org> X-Mailer: git-send-email 1.7.7.6 In-Reply-To: <1363783698-28092-1-git-send-email-dmonakhov@openvz.org> References: <1363783698-28092-1-git-send-email-dmonakhov@openvz.org> Sender: linux-ext4-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-ext4@vger.kernel.org Signed-off-by: Dmitry Monakhov --- fs/block_dev.c | 3 ++- 1 files changed, 2 insertions(+), 1 deletions(-) diff --git a/fs/block_dev.c b/fs/block_dev.c index 172f849..e13d1df 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -228,7 +228,8 @@ struct super_block *freeze_bdev(struct block_device *bdev) * thaw_bdev drops it. */ sb = get_super(bdev); - drop_super(sb); + if (sb) + drop_super(sb); mutex_unlock(&bdev->bd_fsfreeze_mutex); return sb; }