Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753729AbdHVTUc (ORCPT ); Tue, 22 Aug 2017 15:20:32 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:44582 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753474AbdHVTOt (ORCPT ); Tue, 22 Aug 2017 15:14:49 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Munehisa Kamata , Thomas Friebel , Eduardo Valentin , Boris Ostrovsky , Juergen Gross , Konrad Rzeszutek Wilk , Roger Pau Monne , xen-devel@lists.xenproject.org Subject: [PATCH 4.12 27/41] xen-blkfront: use a right index when checking requests Date: Tue, 22 Aug 2017 12:13:55 -0700 Message-Id: <20170822190943.024693871@linuxfoundation.org> X-Mailer: git-send-email 2.14.1 In-Reply-To: <20170822190941.918296529@linuxfoundation.org> References: <20170822190941.918296529@linuxfoundation.org> User-Agent: quilt/0.65 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3424 Lines: 75 4.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Munehisa Kamata commit b15bd8cb37598afb2963f7eb9e2de468d2d60a2f upstream. Since commit d05d7f40791c ("Merge branch 'for-4.8/core' of git://git.kernel.dk/linux-block") and 3fc9d690936f ("Merge branch 'for-4.8/drivers' of git://git.kernel.dk/linux-block"), blkfront_resume() has been using an index for iterating ring_info to check request when iterating blk_shadow in an inner loop. This seems to have been accidentally introduced during the massive rewrite of the block layer macros in the commits. This may cause crash like this: [11798.057074] BUG: unable to handle kernel NULL pointer dereference at 0000000000000048 [11798.058832] IP: [] blkfront_resume+0x10a/0x610 .... [11798.061063] Call Trace: [11798.061063] [] xenbus_dev_resume+0x53/0x140 [11798.061063] [] ? xenbus_dev_probe+0x150/0x150 [11798.061063] [] dpm_run_callback+0x3e/0x110 [11798.061063] [] device_resume+0x88/0x190 [11798.061063] [] dpm_resume+0x100/0x2d0 [11798.061063] [] dpm_resume_end+0x11/0x20 [11798.061063] [] do_suspend+0xe8/0x1a0 [11798.061063] [] shutdown_handler+0xfd/0x130 [11798.061063] [] ? split+0x110/0x110 [11798.061063] [] xenwatch_thread+0x86/0x120 [11798.061063] [] ? prepare_to_wait_event+0x110/0x110 [11798.061063] [] kthread+0xd7/0xf0 [11798.061063] [] ? kfree+0x121/0x170 [11798.061063] [] ? kthread_park+0x60/0x60 [11798.061063] [] ? call_usermodehelper_exec_work+0xb0/0xb0 [11798.061063] [] ? call_usermodehelper_exec_async+0x13a/0x140 [11798.061063] [] ret_from_fork+0x25/0x30 Use the right index in the inner loop. Fixes: d05d7f40791c ("Merge branch 'for-4.8/core' of git://git.kernel.dk/linux-block") Fixes: 3fc9d690936f ("Merge branch 'for-4.8/drivers' of git://git.kernel.dk/linux-block") Signed-off-by: Munehisa Kamata Reviewed-by: Thomas Friebel Reviewed-by: Eduardo Valentin Reviewed-by: Boris Ostrovsky Cc: Juergen Gross Cc: Konrad Rzeszutek Wilk Reviewed-by: Roger Pau Monne Cc: xen-devel@lists.xenproject.org Signed-off-by: Konrad Rzeszutek Wilk Signed-off-by: Greg Kroah-Hartman --- drivers/block/xen-blkfront.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) --- a/drivers/block/xen-blkfront.c +++ b/drivers/block/xen-blkfront.c @@ -2119,9 +2119,9 @@ static int blkfront_resume(struct xenbus /* * Get the bios in the request so we can re-queue them. */ - if (req_op(shadow[i].request) == REQ_OP_FLUSH || - req_op(shadow[i].request) == REQ_OP_DISCARD || - req_op(shadow[i].request) == REQ_OP_SECURE_ERASE || + if (req_op(shadow[j].request) == REQ_OP_FLUSH || + req_op(shadow[j].request) == REQ_OP_DISCARD || + req_op(shadow[j].request) == REQ_OP_SECURE_ERASE || shadow[j].request->cmd_flags & REQ_FUA) { /* * Flush operations don't contain bios, so