![Nicholas Bellinger](/assets/img/avatar_default.png)
This patch fixes two possible NULL pointer dereferences in target v4.0 code where se_tmr release path in core_tmr_release_req() can OOPs upon transport_get_lun_for_tmr() failure by attempting to access se_device or se_tmr->tmr_list without a valid member of se_device->tmr_list during transport_free_se_cmd() release. This patch moves the se_tmr->tmr_dev pointer assignment in transport_get_lun_for_tmr() until after possible -ENODEV failures during unpacked_lun lookup. This addresses an OOPs originally reported with LIO v4.1 upstream on .39 code here: TARGET_CORE[qla2xxx]: Detected NON_EXISTENT_LUN Access for 0x00000000 BUG: unable to handle kernel NULL pointer dereference at 0000000000000550 IP: [<ffffffff81035ec4>] __ticket_spin_trylock+0x4/0x20 PGD 0 Oops: 0000 [#1] SMP last sysfs file: /sys/devices/system/cpu/cpu23/cache/index2/shared_cpu_map CPU 1 Modules linked in: netconsole target_core_pscsi target_core_file tcm_qla2xxx target_core_iblock tcm_loop target_core_mod configfs ipmi_devintf ipmi_si ipmi_msghandler serio_raw i7core_edac ioatdma dca edac_core ps_bdrv ses enclosure usbhid usb_storage ahci qla2xxx hid uas e1000e mpt2sas libahci mlx4_core scsi_transport_fc scsi_transport_sas raid_class scsi_tgt [last unloaded: netconsole] Pid: 0, comm: kworker/0:0 Tainted: G W 2.6.39+ #1 Xyratex Storage Server RIP: 0010:[<ffffffff81035ec4>] [<ffffffff81035ec4>]__ticket_spin_trylock+0x4/0x20 RSP: 0018:ffff88063e803c08 EFLAGS: 00010286 RAX: ffff880619ab45e0 RBX: 0000000000000550 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000550 RBP: ffff88063e803c08 R08: 0000000000000002 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000568 R13: 0000000000000001 R14: 0000000000000000 R15: ffff88060cd96a20 FS: 0000000000000000(0000) GS:ffff88063e800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: 0000000000000550 CR3: 0000000001a03000 CR4: 00000000000006e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process kworker/0:0 (pid: 0, threadinfo ffff880619ab8000, task ffff880619ab45e0) Stack: ffff88063e803c28 ffffffff812cf039 0000000000000550 0000000000000568 ffff88063e803c58 ffffffff8157071e ffffffffa028a1dc ffff88060f7e4600 0000000000000550 ffff880616961480 ffff88063e803c78 ffffffffa028a1dc Call Trace: <IRQ> [<ffffffff812cf039>] do_raw_spin_trylock+0x19/0x50 [<ffffffff8157071e>] _raw_spin_lock+0x3e/0x70 [<ffffffffa028a1dc>] ? core_tmr_release_req+0x2c/0x60 [target_core_mod] [<ffffffffa028a1dc>] core_tmr_release_req+0x2c/0x60 [target_core_mod] [<ffffffffa028d0d2>] transport_free_se_cmd+0x22/0x50 [target_core_mod] [<ffffffffa028d120>] transport_release_cmd_to_pool+0x20/0x40 [target_core_mod] [<ffffffffa028e525>] transport_generic_free_cmd+0xa5/0xb0 [target_core_mod] [<ffffffffa0147cc4>] tcm_qla2xxx_handle_tmr+0xc4/0xd0 [tcm_qla2xxx] [<ffffffffa0191ba3>] __qla24xx_handle_abts+0xd3/0x150 [qla2xxx] [<ffffffffa0197651>] qla_tgt_response_pkt+0x171/0x520 [qla2xxx] [<ffffffffa0197a2d>] qla_tgt_response_pkt_all_vps+0x2d/0x220 [qla2xxx] [<ffffffffa0171dd3>] qla24xx_process_response_queue+0x1a3/0x670 [qla2xxx] [<ffffffffa0196281>] ? qla24xx_atio_pkt+0x81/0x120 [qla2xxx] [<ffffffffa0174025>] ? qla24xx_msix_default+0x45/0x2a0 [qla2xxx] [<ffffffffa0174198>] qla24xx_msix_default+0x1b8/0x2a0 [qla2xxx] [<ffffffff810dadb4>] handle_irq_event_percpu+0x54/0x210 [<ffffffff810dafb8>] handle_irq_event+0x48/0x70 [<ffffffff810dd5ee>] ? handle_edge_irq+0x1e/0x110 [<ffffffff810dd647>] handle_edge_irq+0x77/0x110 [<ffffffff8100d362>] handle_irq+0x22/0x40 [<ffffffff8157b28d>] do_IRQ+0x5d/0xe0 [<ffffffff81571413>] common_interrupt+0x13/0x13 <EOI> [<ffffffff813003f7>] ? intel_idle+0xd7/0x130 [<ffffffff813003f0>] ? intel_idle+0xd0/0x130 [<ffffffff8144832b>] cpuidle_idle_call+0xab/0x1c0 [<ffffffff8100a26b>] cpu_idle+0xab/0xf0 [<ffffffff81566c59>] start_secondary+0x1cb/0x1d2 Reported-by: Roland Dreier <roland@purestorage.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
417 lines
13 KiB
C
417 lines
13 KiB
C
/*******************************************************************************
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* Filename: target_core_tmr.c
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*
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* This file contains SPC-3 task management infrastructure
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*
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* Copyright (c) 2009,2010 Rising Tide Systems
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* Copyright (c) 2009,2010 Linux-iSCSI.org
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*
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* Nicholas A. Bellinger <nab@kernel.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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******************************************************************************/
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#include <linux/version.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/list.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_cmnd.h>
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#include <target/target_core_base.h>
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#include <target/target_core_device.h>
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#include <target/target_core_tmr.h>
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#include <target/target_core_transport.h>
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#include <target/target_core_fabric_ops.h>
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#include <target/target_core_configfs.h>
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#include "target_core_alua.h"
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#include "target_core_pr.h"
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#define DEBUG_LUN_RESET
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#ifdef DEBUG_LUN_RESET
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#define DEBUG_LR(x...) printk(KERN_INFO x)
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#else
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#define DEBUG_LR(x...)
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#endif
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struct se_tmr_req *core_tmr_alloc_req(
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struct se_cmd *se_cmd,
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void *fabric_tmr_ptr,
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u8 function)
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{
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struct se_tmr_req *tmr;
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tmr = kmem_cache_zalloc(se_tmr_req_cache, (in_interrupt()) ?
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GFP_ATOMIC : GFP_KERNEL);
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if (!(tmr)) {
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printk(KERN_ERR "Unable to allocate struct se_tmr_req\n");
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return ERR_PTR(-ENOMEM);
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}
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tmr->task_cmd = se_cmd;
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tmr->fabric_tmr_ptr = fabric_tmr_ptr;
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tmr->function = function;
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INIT_LIST_HEAD(&tmr->tmr_list);
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return tmr;
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}
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EXPORT_SYMBOL(core_tmr_alloc_req);
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void core_tmr_release_req(
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struct se_tmr_req *tmr)
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{
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struct se_device *dev = tmr->tmr_dev;
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if (!dev) {
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kmem_cache_free(se_tmr_req_cache, tmr);
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return;
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}
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spin_lock(&dev->se_tmr_lock);
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list_del(&tmr->tmr_list);
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spin_unlock(&dev->se_tmr_lock);
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kmem_cache_free(se_tmr_req_cache, tmr);
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}
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static void core_tmr_handle_tas_abort(
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struct se_node_acl *tmr_nacl,
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struct se_cmd *cmd,
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int tas,
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int fe_count)
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{
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if (!(fe_count)) {
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transport_cmd_finish_abort(cmd, 1);
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return;
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}
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/*
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* TASK ABORTED status (TAS) bit support
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*/
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if (((tmr_nacl != NULL) &&
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(tmr_nacl == cmd->se_sess->se_node_acl)) || tas)
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transport_send_task_abort(cmd);
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transport_cmd_finish_abort(cmd, 0);
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}
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int core_tmr_lun_reset(
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struct se_device *dev,
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struct se_tmr_req *tmr,
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struct list_head *preempt_and_abort_list,
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struct se_cmd *prout_cmd)
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{
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struct se_cmd *cmd;
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struct se_queue_req *qr, *qr_tmp;
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struct se_node_acl *tmr_nacl = NULL;
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struct se_portal_group *tmr_tpg = NULL;
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struct se_queue_obj *qobj = dev->dev_queue_obj;
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struct se_tmr_req *tmr_p, *tmr_pp;
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struct se_task *task, *task_tmp;
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unsigned long flags;
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int fe_count, state, tas;
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/*
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* TASK_ABORTED status bit, this is configurable via ConfigFS
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* struct se_device attributes. spc4r17 section 7.4.6 Control mode page
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*
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* A task aborted status (TAS) bit set to zero specifies that aborted
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* tasks shall be terminated by the device server without any response
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* to the application client. A TAS bit set to one specifies that tasks
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* aborted by the actions of an I_T nexus other than the I_T nexus on
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* which the command was received shall be completed with TASK ABORTED
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* status (see SAM-4).
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*/
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tas = DEV_ATTRIB(dev)->emulate_tas;
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/*
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* Determine if this se_tmr is coming from a $FABRIC_MOD
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* or struct se_device passthrough..
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*/
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if (tmr && tmr->task_cmd && tmr->task_cmd->se_sess) {
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tmr_nacl = tmr->task_cmd->se_sess->se_node_acl;
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tmr_tpg = tmr->task_cmd->se_sess->se_tpg;
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if (tmr_nacl && tmr_tpg) {
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DEBUG_LR("LUN_RESET: TMR caller fabric: %s"
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" initiator port %s\n",
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TPG_TFO(tmr_tpg)->get_fabric_name(),
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tmr_nacl->initiatorname);
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}
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}
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DEBUG_LR("LUN_RESET: %s starting for [%s], tas: %d\n",
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(preempt_and_abort_list) ? "Preempt" : "TMR",
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TRANSPORT(dev)->name, tas);
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/*
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* Release all pending and outgoing TMRs aside from the received
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* LUN_RESET tmr..
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*/
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spin_lock(&dev->se_tmr_lock);
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list_for_each_entry_safe(tmr_p, tmr_pp, &dev->dev_tmr_list, tmr_list) {
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/*
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* Allow the received TMR to return with FUNCTION_COMPLETE.
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*/
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if (tmr && (tmr_p == tmr))
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continue;
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cmd = tmr_p->task_cmd;
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if (!(cmd)) {
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printk(KERN_ERR "Unable to locate struct se_cmd for TMR\n");
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continue;
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}
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/*
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* If this function was called with a valid pr_res_key
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* parameter (eg: for PROUT PREEMPT_AND_ABORT service action
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* skip non regisration key matching TMRs.
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*/
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if ((preempt_and_abort_list != NULL) &&
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(core_scsi3_check_cdb_abort_and_preempt(
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preempt_and_abort_list, cmd) != 0))
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continue;
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spin_unlock(&dev->se_tmr_lock);
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spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
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if (!(atomic_read(&T_TASK(cmd)->t_transport_active))) {
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spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
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spin_lock(&dev->se_tmr_lock);
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continue;
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}
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if (cmd->t_state == TRANSPORT_ISTATE_PROCESSING) {
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spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
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spin_lock(&dev->se_tmr_lock);
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continue;
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}
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DEBUG_LR("LUN_RESET: %s releasing TMR %p Function: 0x%02x,"
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" Response: 0x%02x, t_state: %d\n",
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(preempt_and_abort_list) ? "Preempt" : "", tmr_p,
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tmr_p->function, tmr_p->response, cmd->t_state);
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spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
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transport_cmd_finish_abort_tmr(cmd);
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spin_lock(&dev->se_tmr_lock);
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}
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spin_unlock(&dev->se_tmr_lock);
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/*
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* Complete outstanding struct se_task CDBs with TASK_ABORTED SAM status.
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* This is following sam4r17, section 5.6 Aborting commands, Table 38
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* for TMR LUN_RESET:
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*
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* a) "Yes" indicates that each command that is aborted on an I_T nexus
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* other than the one that caused the SCSI device condition is
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* completed with TASK ABORTED status, if the TAS bit is set to one in
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* the Control mode page (see SPC-4). "No" indicates that no status is
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* returned for aborted commands.
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*
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* d) If the logical unit reset is caused by a particular I_T nexus
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* (e.g., by a LOGICAL UNIT RESET task management function), then "yes"
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* (TASK_ABORTED status) applies.
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*
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* Otherwise (e.g., if triggered by a hard reset), "no"
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* (no TASK_ABORTED SAM status) applies.
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*
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* Note that this seems to be independent of TAS (Task Aborted Status)
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* in the Control Mode Page.
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*/
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spin_lock_irqsave(&dev->execute_task_lock, flags);
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list_for_each_entry_safe(task, task_tmp, &dev->state_task_list,
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t_state_list) {
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if (!(TASK_CMD(task))) {
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printk(KERN_ERR "TASK_CMD(task) is NULL!\n");
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continue;
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}
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cmd = TASK_CMD(task);
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if (!T_TASK(cmd)) {
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printk(KERN_ERR "T_TASK(cmd) is NULL for task: %p cmd:"
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" %p ITT: 0x%08x\n", task, cmd,
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CMD_TFO(cmd)->get_task_tag(cmd));
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continue;
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}
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/*
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* For PREEMPT_AND_ABORT usage, only process commands
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* with a matching reservation key.
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*/
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if ((preempt_and_abort_list != NULL) &&
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(core_scsi3_check_cdb_abort_and_preempt(
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preempt_and_abort_list, cmd) != 0))
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continue;
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/*
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* Not aborting PROUT PREEMPT_AND_ABORT CDB..
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*/
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if (prout_cmd == cmd)
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continue;
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list_del(&task->t_state_list);
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atomic_set(&task->task_state_active, 0);
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spin_unlock_irqrestore(&dev->execute_task_lock, flags);
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spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
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DEBUG_LR("LUN_RESET: %s cmd: %p task: %p"
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" ITT/CmdSN: 0x%08x/0x%08x, i_state: %d, t_state/"
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"def_t_state: %d/%d cdb: 0x%02x\n",
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(preempt_and_abort_list) ? "Preempt" : "", cmd, task,
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CMD_TFO(cmd)->get_task_tag(cmd), 0,
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CMD_TFO(cmd)->get_cmd_state(cmd), cmd->t_state,
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cmd->deferred_t_state, T_TASK(cmd)->t_task_cdb[0]);
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DEBUG_LR("LUN_RESET: ITT[0x%08x] - pr_res_key: 0x%016Lx"
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" t_task_cdbs: %d t_task_cdbs_left: %d"
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" t_task_cdbs_sent: %d -- t_transport_active: %d"
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" t_transport_stop: %d t_transport_sent: %d\n",
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CMD_TFO(cmd)->get_task_tag(cmd), cmd->pr_res_key,
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T_TASK(cmd)->t_task_cdbs,
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atomic_read(&T_TASK(cmd)->t_task_cdbs_left),
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atomic_read(&T_TASK(cmd)->t_task_cdbs_sent),
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atomic_read(&T_TASK(cmd)->t_transport_active),
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atomic_read(&T_TASK(cmd)->t_transport_stop),
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atomic_read(&T_TASK(cmd)->t_transport_sent));
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if (atomic_read(&task->task_active)) {
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atomic_set(&task->task_stop, 1);
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spin_unlock_irqrestore(
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&T_TASK(cmd)->t_state_lock, flags);
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DEBUG_LR("LUN_RESET: Waiting for task: %p to shutdown"
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" for dev: %p\n", task, dev);
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wait_for_completion(&task->task_stop_comp);
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DEBUG_LR("LUN_RESET Completed task: %p shutdown for"
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" dev: %p\n", task, dev);
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spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
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atomic_dec(&T_TASK(cmd)->t_task_cdbs_left);
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atomic_set(&task->task_active, 0);
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atomic_set(&task->task_stop, 0);
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} else {
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if (atomic_read(&task->task_execute_queue) != 0)
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transport_remove_task_from_execute_queue(task, dev);
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}
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__transport_stop_task_timer(task, &flags);
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if (!(atomic_dec_and_test(&T_TASK(cmd)->t_task_cdbs_ex_left))) {
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spin_unlock_irqrestore(
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&T_TASK(cmd)->t_state_lock, flags);
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DEBUG_LR("LUN_RESET: Skipping task: %p, dev: %p for"
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" t_task_cdbs_ex_left: %d\n", task, dev,
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atomic_read(&T_TASK(cmd)->t_task_cdbs_ex_left));
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spin_lock_irqsave(&dev->execute_task_lock, flags);
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continue;
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}
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fe_count = atomic_read(&T_TASK(cmd)->t_fe_count);
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if (atomic_read(&T_TASK(cmd)->t_transport_active)) {
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DEBUG_LR("LUN_RESET: got t_transport_active = 1 for"
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" task: %p, t_fe_count: %d dev: %p\n", task,
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fe_count, dev);
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atomic_set(&T_TASK(cmd)->t_transport_aborted, 1);
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spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock,
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flags);
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core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, fe_count);
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spin_lock_irqsave(&dev->execute_task_lock, flags);
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continue;
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}
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DEBUG_LR("LUN_RESET: Got t_transport_active = 0 for task: %p,"
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" t_fe_count: %d dev: %p\n", task, fe_count, dev);
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atomic_set(&T_TASK(cmd)->t_transport_aborted, 1);
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spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
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core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, fe_count);
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spin_lock_irqsave(&dev->execute_task_lock, flags);
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}
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spin_unlock_irqrestore(&dev->execute_task_lock, flags);
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/*
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* Release all commands remaining in the struct se_device cmd queue.
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*
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* This follows the same logic as above for the struct se_device
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* struct se_task state list, where commands are returned with
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* TASK_ABORTED status, if there is an outstanding $FABRIC_MOD
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* reference, otherwise the struct se_cmd is released.
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*/
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spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
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list_for_each_entry_safe(qr, qr_tmp, &qobj->qobj_list, qr_list) {
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cmd = (struct se_cmd *)qr->cmd;
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if (!(cmd)) {
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/*
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* Skip these for non PREEMPT_AND_ABORT usage..
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*/
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if (preempt_and_abort_list != NULL)
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continue;
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atomic_dec(&qobj->queue_cnt);
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list_del(&qr->qr_list);
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|
kfree(qr);
|
|
continue;
|
|
}
|
|
/*
|
|
* For PREEMPT_AND_ABORT usage, only process commands
|
|
* with a matching reservation key.
|
|
*/
|
|
if ((preempt_and_abort_list != NULL) &&
|
|
(core_scsi3_check_cdb_abort_and_preempt(
|
|
preempt_and_abort_list, cmd) != 0))
|
|
continue;
|
|
/*
|
|
* Not aborting PROUT PREEMPT_AND_ABORT CDB..
|
|
*/
|
|
if (prout_cmd == cmd)
|
|
continue;
|
|
|
|
atomic_dec(&T_TASK(cmd)->t_transport_queue_active);
|
|
atomic_dec(&qobj->queue_cnt);
|
|
list_del(&qr->qr_list);
|
|
spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
|
|
|
|
state = qr->state;
|
|
kfree(qr);
|
|
|
|
DEBUG_LR("LUN_RESET: %s from Device Queue: cmd: %p t_state:"
|
|
" %d t_fe_count: %d\n", (preempt_and_abort_list) ?
|
|
"Preempt" : "", cmd, state,
|
|
atomic_read(&T_TASK(cmd)->t_fe_count));
|
|
/*
|
|
* Signal that the command has failed via cmd->se_cmd_flags,
|
|
* and call TFO->new_cmd_failure() to wakeup any fabric
|
|
* dependent code used to wait for unsolicited data out
|
|
* allocation to complete. The fabric module is expected
|
|
* to dump any remaining unsolicited data out for the aborted
|
|
* command at this point.
|
|
*/
|
|
transport_new_cmd_failure(cmd);
|
|
|
|
core_tmr_handle_tas_abort(tmr_nacl, cmd, tas,
|
|
atomic_read(&T_TASK(cmd)->t_fe_count));
|
|
spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
|
|
}
|
|
spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
|
|
/*
|
|
* Clear any legacy SPC-2 reservation when called during
|
|
* LOGICAL UNIT RESET
|
|
*/
|
|
if (!(preempt_and_abort_list) &&
|
|
(dev->dev_flags & DF_SPC2_RESERVATIONS)) {
|
|
spin_lock(&dev->dev_reservation_lock);
|
|
dev->dev_reserved_node_acl = NULL;
|
|
dev->dev_flags &= ~DF_SPC2_RESERVATIONS;
|
|
spin_unlock(&dev->dev_reservation_lock);
|
|
printk(KERN_INFO "LUN_RESET: SCSI-2 Released reservation\n");
|
|
}
|
|
|
|
spin_lock_irq(&dev->stats_lock);
|
|
dev->num_resets++;
|
|
spin_unlock_irq(&dev->stats_lock);
|
|
|
|
DEBUG_LR("LUN_RESET: %s for [%s] Complete\n",
|
|
(preempt_and_abort_list) ? "Preempt" : "TMR",
|
|
TRANSPORT(dev)->name);
|
|
return 0;
|
|
}
|