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    Subject[PATCH AUTOSEL 4.9 26/42] scsi: atari_scsi: sun3_scsi: Set sg_tablesize to 1 instead of SG_NONE
    Date
    From: Finn Thain <fthain@telegraphics.com.au>

    [ Upstream commit 79172ab20bfd8437b277254028efdb68484e2c21 ]

    Since the scsi subsystem adopted the blk-mq API, a host with zero
    sg_tablesize crashes with a NULL pointer dereference.

    blk_queue_max_segments: set to minimum 1
    scsi 0:0:0:0: Direct-Access QEMU QEMU HARDDISK 2.5+ PQ: 0 ANSI: 5
    scsi target0:0:0: Beginning Domain Validation
    scsi target0:0:0: Domain Validation skipping write tests
    scsi target0:0:0: Ending Domain Validation
    blk_queue_max_segments: set to minimum 1
    scsi 0:0:1:0: Direct-Access QEMU QEMU HARDDISK 2.5+ PQ: 0 ANSI: 5
    scsi target0:0:1: Beginning Domain Validation
    scsi target0:0:1: Domain Validation skipping write tests
    scsi target0:0:1: Ending Domain Validation
    blk_queue_max_segments: set to minimum 1
    scsi 0:0:2:0: CD-ROM QEMU QEMU CD-ROM 2.5+ PQ: 0 ANSI: 5
    scsi target0:0:2: Beginning Domain Validation
    scsi target0:0:2: Domain Validation skipping write tests
    scsi target0:0:2: Ending Domain Validation
    blk_queue_max_segments: set to minimum 1
    blk_queue_max_segments: set to minimum 1
    blk_queue_max_segments: set to minimum 1
    blk_queue_max_segments: set to minimum 1
    sr 0:0:2:0: Power-on or device reset occurred
    sd 0:0:0:0: Power-on or device reset occurred
    sd 0:0:1:0: Power-on or device reset occurred
    sd 0:0:0:0: [sda] 10485762 512-byte logical blocks: (5.37 GB/5.00 GiB)
    sd 0:0:0:0: [sda] Write Protect is off
    sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
    Unable to handle kernel NULL pointer dereference at virtual address (ptrval)
    Oops: 00000000
    Modules linked in:
    PC: [<001cd874>] blk_mq_free_request+0x66/0xe2
    SR: 2004 SP: (ptrval) a2: 00874520
    d0: 00000000 d1: 00000000 d2: 009ba800 d3: 00000000
    d4: 00000000 d5: 08000002 a0: 0087be68 a1: 009a81e0
    Process kworker/u2:2 (pid: 15, task=(ptrval))
    Frame format=7 eff addr=0000007a ssw=0505 faddr=0000007a
    wb 1 stat/addr/data: 0000 00000000 00000000
    wb 2 stat/addr/data: 0000 00000000 00000000
    wb 3 stat/addr/data: 0000 0000007a 00000000
    push data: 00000000 00000000 00000000 00000000
    Stack from 0087bd98:
    00000002 00000000 0087be72 009a7820 0087bdb4 001c4f6c 009a7820 0087bdd4
    0024d200 009a7820 0024d0dc 0087be72 009baa00 0087be68 009a5000 0087be7c
    00265d10 009a5000 0087be72 00000003 00000000 00000000 00000000 0087be68
    00000bb8 00000005 00000000 00000000 00000000 00000000 00265c56 00000000
    009ba60c 0036ddf4 00000002 ffffffff 009baa00 009ba600 009a50d6 0087be74
    00227ba0 009baa08 00000001 009baa08 009ba60c 0036ddf4 00000000 00000000
    Call Trace: [<001c4f6c>] blk_put_request+0xe/0x14
    [<0024d200>] __scsi_execute+0x124/0x174
    [<0024d0dc>] __scsi_execute+0x0/0x174
    [<00265d10>] sd_revalidate_disk+0xba/0x1f02
    [<00265c56>] sd_revalidate_disk+0x0/0x1f02
    [<0036ddf4>] strlen+0x0/0x22
    [<00227ba0>] device_add+0x3da/0x604
    [<0036ddf4>] strlen+0x0/0x22
    [<00267e64>] sd_probe+0x30c/0x4b4
    [<0002da44>] process_one_work+0x0/0x402
    [<0022b978>] really_probe+0x226/0x354
    [<0022bc34>] driver_probe_device+0xa4/0xf0
    [<0002da44>] process_one_work+0x0/0x402
    [<0022bcd0>] __driver_attach_async_helper+0x50/0x70
    [<00035dae>] async_run_entry_fn+0x36/0x130
    [<0002db88>] process_one_work+0x144/0x402
    [<0002e1aa>] worker_thread+0x0/0x570
    [<0002e29a>] worker_thread+0xf0/0x570
    [<0002e1aa>] worker_thread+0x0/0x570
    [<003768d8>] schedule+0x0/0xb8
    [<0003f58c>] __init_waitqueue_head+0x0/0x12
    [<00033e92>] kthread+0xc2/0xf6
    [<000331e8>] kthread_parkme+0x0/0x4e
    [<003768d8>] schedule+0x0/0xb8
    [<00033dd0>] kthread+0x0/0xf6
    [<00002c10>] ret_from_kernel_thread+0xc/0x14
    Code: 0280 0006 0800 56c0 4400 0280 0000 00ff <52b4> 0c3a 082b 0006 0013 6706 2042 53a8 00c4 4ab9 0047 3374 6640 202d 000c 670c
    Disabling lock debugging due to kernel taint

    Avoid this by setting sg_tablesize = 1.

    Link: https://lore.kernel.org/r/4567bcae94523b47d6f3b77450ba305823bca479.1572656814.git.fthain@telegraphics.com.au
    Reported-and-tested-by: Michael Schmitz <schmitzmic@gmail.com>
    Reviewed-by: Michael Schmitz <schmitzmic@gmail.com>
    References: commit 68ab2d76e4be ("scsi: cxlflash: Set sg_tablesize to 1 instead of SG_NONE")
    Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
    Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/scsi/atari_scsi.c | 6 +++---
    drivers/scsi/mac_scsi.c | 2 +-
    drivers/scsi/sun3_scsi.c | 4 ++--
    3 files changed, 6 insertions(+), 6 deletions(-)

    diff --git a/drivers/scsi/atari_scsi.c b/drivers/scsi/atari_scsi.c
    index a59ad94ea52b3..9dc4b689f94b0 100644
    --- a/drivers/scsi/atari_scsi.c
    +++ b/drivers/scsi/atari_scsi.c
    @@ -753,7 +753,7 @@ static int __init atari_scsi_probe(struct platform_device *pdev)
    atari_scsi_template.sg_tablesize = SG_ALL;
    } else {
    atari_scsi_template.can_queue = 1;
    - atari_scsi_template.sg_tablesize = SG_NONE;
    + atari_scsi_template.sg_tablesize = 1;
    }

    if (setup_can_queue > 0)
    @@ -762,8 +762,8 @@ static int __init atari_scsi_probe(struct platform_device *pdev)
    if (setup_cmd_per_lun > 0)
    atari_scsi_template.cmd_per_lun = setup_cmd_per_lun;

    - /* Leave sg_tablesize at 0 on a Falcon! */
    - if (ATARIHW_PRESENT(TT_SCSI) && setup_sg_tablesize >= 0)
    + /* Don't increase sg_tablesize on Falcon! */
    + if (ATARIHW_PRESENT(TT_SCSI) && setup_sg_tablesize > 0)
    atari_scsi_template.sg_tablesize = setup_sg_tablesize;

    if (setup_hostid >= 0) {
    diff --git a/drivers/scsi/mac_scsi.c b/drivers/scsi/mac_scsi.c
    index 5648d30c73768..5aa60bbbd09ad 100644
    --- a/drivers/scsi/mac_scsi.c
    +++ b/drivers/scsi/mac_scsi.c
    @@ -378,7 +378,7 @@ static int __init mac_scsi_probe(struct platform_device *pdev)
    mac_scsi_template.can_queue = setup_can_queue;
    if (setup_cmd_per_lun > 0)
    mac_scsi_template.cmd_per_lun = setup_cmd_per_lun;
    - if (setup_sg_tablesize >= 0)
    + if (setup_sg_tablesize > 0)
    mac_scsi_template.sg_tablesize = setup_sg_tablesize;
    if (setup_hostid >= 0)
    mac_scsi_template.this_id = setup_hostid & 7;
    diff --git a/drivers/scsi/sun3_scsi.c b/drivers/scsi/sun3_scsi.c
    index 3c4c07038948d..6f75693cf7d28 100644
    --- a/drivers/scsi/sun3_scsi.c
    +++ b/drivers/scsi/sun3_scsi.c
    @@ -419,7 +419,7 @@ static struct scsi_host_template sun3_scsi_template = {
    .eh_bus_reset_handler = sun3scsi_bus_reset,
    .can_queue = 16,
    .this_id = 7,
    - .sg_tablesize = SG_NONE,
    + .sg_tablesize = 1,
    .cmd_per_lun = 2,
    .use_clustering = DISABLE_CLUSTERING,
    .cmd_size = NCR5380_CMD_SIZE,
    @@ -440,7 +440,7 @@ static int __init sun3_scsi_probe(struct platform_device *pdev)
    sun3_scsi_template.can_queue = setup_can_queue;
    if (setup_cmd_per_lun > 0)
    sun3_scsi_template.cmd_per_lun = setup_cmd_per_lun;
    - if (setup_sg_tablesize >= 0)
    + if (setup_sg_tablesize > 0)
    sun3_scsi_template.sg_tablesize = setup_sg_tablesize;
    if (setup_hostid >= 0)
    sun3_scsi_template.this_id = setup_hostid & 7;
    --
    2.20.1
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