kernel/drivers/scsi/device_handler, branch linux-5.1.y

scsi: scsi_dh_alua: Fix possible null-ptr-deref

2019-06-22T06:09:15Z

[ Upstream commit 12e750bc62044de096ab9a95201213fd912b9994 ] If alloc_workqueue fails in alua_init, it should return -ENOMEM, otherwise it will trigger null-ptr-deref while unloading module which calls destroy_workqueue dereference wq->lock like this: BUG: KASAN: null-ptr-deref in __lock_acquire+0x6b4/0x1ee0 Read of size 8 at addr 0000000000000080 by task syz-executor.0/7045 CPU: 0 PID: 7045 Comm: syz-executor.0 Tainted: G C 5.1.0+ #28 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 Call Trace: dump_stack+0xa9/0x10e __kasan_report+0x171/0x18d ? __lock_acquire+0x6b4/0x1ee0 kasan_report+0xe/0x20 __lock_acquire+0x6b4/0x1ee0 lock_acquire+0xb4/0x1b0 __mutex_lock+0xd8/0xb90 drain_workqueue+0x25/0x290 destroy_workqueue+0x1f/0x3f0 __x64_sys_delete_module+0x244/0x330 do_syscall_64+0x72/0x2a0 entry_SYSCALL_64_after_hwframe+0x49/0xbe Reported-by: Hulk Robot Fixes: 03197b61c5ec ("scsi_dh_alua: Use workqueue for RTPG") Signed-off-by: YueHaibing Reviewed-by: Bart Van Assche Signed-off-by: Martin K. Petersen Signed-off-by: Sasha Levin

scsi: return blk_status_t from device handler ->prep_fn

2018-11-10T02:17:14Z

Remove the last use of the old BLKPREP_* values, which get converted to BLK_STS_* later anyway. Reviewed-by: Johannes Thumshirn Reviewed-by: Bart Van Assche Signed-off-by: Christoph Hellwig Signed-off-by: Jens Axboe

Merge branch 'fixes' into misc

2018-04-04T00:38:39Z

Somewhat nasty merge due to conflicts between "33b28357dd00 scsi: qla2xxx: Fix Async GPN_FT for FCP and FC-NVMe scan" and "2b5b96473efc scsi: qla2xxx: Fix FC-NVMe LUN discovery" Merge is non-trivial and has been verified by Qlogic (Cavium) Signed-off-by: James E.J. Bottomley

scsi: scsi_dh_alua: Correct comment for alua_alloc_pg()

2018-03-15T04:32:02Z

In the comment for function alua_alloc_pg() the argument '@h' is mistakenly referred to. Fix this by replacing it with the correct argument reference, '@tpgs', and provide a short description. Signed-off-by: John Pittman Reviewed-by Laurence Oberman Signed-off-by: Martin K. Petersen

scsi: device_handler: remove VLAs

2018-03-13T02:37:20Z

In preparation to enabling -Wvla, remove VLAs and replace them with fixed-length arrays instead. scsi_dh_{alua,emc,rdac} use variable-length array declarations to store command blocks, with the appropriate size as determined by COMMAND_SIZE. This patch replaces these with fixed-sized arrays using MAX_COMMAND_SIZE, so that the array size can be determined at compile time. This was prompted by https://lkml.org/lkml/2018/3/7/621 Signed-off-by: Stephen Kitt Reviewed-by: Hannes Reinecke Signed-off-by: Martin K. Petersen

scsi: scsi_dh: Document alua_rtpg_queue() arguments

2018-01-31T03:26:26Z

Since commit 3a025e1d1c2e ("Add optional check for bad kernel-doc comments") building with W=1 causes warnings to appear for issues in kernel-doc headers. This patch avoids that the following warnings are reported when building with W=1: drivers/scsi/device_handler/scsi_dh_alua.c:867: warning: No description found for parameter 'pg' drivers/scsi/device_handler/scsi_dh_alua.c:867: warning: No description found for parameter 'sdev' drivers/scsi/device_handler/scsi_dh_alua.c:867: warning: No description found for parameter 'qdata' drivers/scsi/device_handler/scsi_dh_alua.c:867: warning: No description found for parameter 'force' Signed-off-by: Bart Van Assche Cc: Christoph Hellwig Cc: Hannes Reinecke Cc: Johannes Thumshirn Reviewed-by: Hannes Reinecke Reviewed-by: Johannes Thumshirn Signed-off-by: Martin K. Petersen

scsi: scsi_dh_alua: skip RTPG for devices only supporting active/optimized

2018-01-11T04:25:11Z

For hardware only supporting active/optimized there's no point in ever re-issuing RTPG as the only new state we can possibly read is active/optimized. This avoid spurious errors during path failover on such arrays. Signed-off-by: Hannes Reinecke Reviewed-by: Bart Van Assche Signed-off-by: Martin K. Petersen

scsi: scsi_dh: Return SCSI_DH_XX error code from ->attach()

2017-09-25T23:03:14Z

Rather than having each device handler implementing their own error mapping, have the ->attach() call return a SCSI_DH_XXX error code and implement the mapping in scsi_dh_handler_attach(). Suggested-by: Christoph Hellwig Signed-off-by: Hannes Reinecke Reviewed-by: Johannes Thumshirn Signed-off-by: Martin K. Petersen

scsi: scsi_dh_alua: remove synchronous STPG support

2017-06-26T16:44:35Z

Since 9c58b395 ("scsi: scsi_devinfo: remove synchronous ALUA for NETAPP devices") this code is unused. Signed-off-by: Christoph Hellwig Reviewed-by: Bart Van Assche Signed-off-by: Martin K. Petersen

scsi: scsi_dh_rdac: Use ctlr directly in rdac_failover_get()

2017-05-24T01:53:15Z

rdac_failover_get references struct rdac_controller as ctlr->ms_sdev->handler_data->ctlr for no apparent reason. Besides being inefficient this also introduces a null-pointer dereference as send_mode_select() sets ctlr->ms_sdev to NULL before calling rdac_failover_get(): [ 18.432550] device-mapper: multipath service-time: version 0.3.0 loaded [ 18.436124] BUG: unable to handle kernel NULL pointer dereference at 0000000000000790 [ 18.436129] IP: send_mode_select+0xca/0x560 [ 18.436129] PGD 0 [ 18.436130] P4D 0 [ 18.436130] [ 18.436132] Oops: 0000 [#1] SMP [ 18.436133] Modules linked in: dm_service_time sd_mod dm_multipath amdkfd amd_iommu_v2 radeon(+) i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops ttm qla2xxx drm serio_raw scsi_transport_fc bnx2 i2c_core dm_mirror dm_region_hash dm_log dm_mod [ 18.436143] CPU: 4 PID: 443 Comm: kworker/u16:2 Not tainted 4.12.0-rc1.1.el7.test.x86_64 #1 [ 18.436144] Hardware name: IBM BladeCenter LS22 -[79013SG]-/Server Blade, BIOS -[L8E164AUS-1.07]- 05/25/2011 [ 18.436145] Workqueue: kmpath_rdacd send_mode_select [ 18.436146] task: ffff880225116a40 task.stack: ffffc90002bd8000 [ 18.436148] RIP: 0010:send_mode_select+0xca/0x560 [ 18.436148] RSP: 0018:ffffc90002bdbda8 EFLAGS: 00010246 [ 18.436149] RAX: 0000000000000000 RBX: ffffc90002bdbe08 RCX: ffff88017ef04a80 [ 18.436150] RDX: ffffc90002bdbe08 RSI: ffff88017ef04a80 RDI: ffff8802248e4388 [ 18.436151] RBP: ffffc90002bdbe48 R08: 0000000000000000 R09: ffffffff81c104c0 [ 18.436151] R10: 00000000000001ff R11: 000000000000035a R12: ffffc90002bdbdd8 [ 18.436152] R13: ffff8802248e4390 R14: ffff880225152800 R15: ffff8802248e4400 [ 18.436153] FS: 0000000000000000(0000) GS:ffff880227d00000(0000) knlGS:0000000000000000 [ 18.436154] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 18.436154] CR2: 0000000000000790 CR3: 000000042535b000 CR4: 00000000000006e0 [ 18.436155] Call Trace: [ 18.436159] ? rdac_activate+0x14e/0x150 [ 18.436161] ? refcount_dec_and_test+0x11/0x20 [ 18.436162] ? kobject_put+0x1c/0x50 [ 18.436165] ? scsi_dh_activate+0x6f/0xd0 [ 18.436168] process_one_work+0x149/0x360 [ 18.436170] worker_thread+0x4d/0x3c0 [ 18.436172] kthread+0x109/0x140 [ 18.436173] ? rescuer_thread+0x380/0x380 [ 18.436174] ? kthread_park+0x60/0x60 [ 18.436176] ret_from_fork+0x2c/0x40 [ 18.436177] Code: 49 c7 46 20 00 00 00 00 4c 89 ef c6 07 00 0f 1f 40 00 45 31 ed c7 45 b0 05 00 00 00 44 89 6d b4 4d 89 f5 4c 8b 75 a8 49 8b 45 20 <48> 8b b0 90 07 00 00 48 8b 56 10 8b 42 10 48 8d 7a 28 85 c0 0f [ 18.436192] RIP: send_mode_select+0xca/0x560 RSP: ffffc90002bdbda8 [ 18.436192] CR2: 0000000000000790 [ 18.436198] ---[ end trace 40f3e4dca1ffabdd ]--- [ 18.436199] Kernel panic - not syncing: Fatal exception [ 18.436222] Kernel Offset: disabled [-- MARK -- Thu May 18 11:45:00 2017] Fixes: 327825574132 scsi_dh_rdac: switch to scsi_execute_req_flags() Cc: stable@vger.kernel.org Signed-off-by: Artem Savkov Reviewed-by: Christoph Hellwig Signed-off-by: Martin K. Petersen