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    Subject[PATCH 4.19 058/205] scsi: qla2xxx: Fix for double free of SRB structure
    Date
    4.19-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Giridhar Malavali <giridhar.malavali@cavium.com>

    commit bcc71cc3cde1468958a3ea859276d8d1a1a68265 upstream.

    This patch fixes issue during switch command query where driver was freeing
    SRB resources multiple times

    Following stack trace will be seen
    [ 853.436234] BUG: unable to handle kernel NULL pointer dereference at
    0000000000000001
    [ 853.436348] IP: [<ffffffff811df514>] kmem_cache_alloc+0x74/0x1e0
    [ 853.436476] PGD 0
    [ 853.436601] Oops: 0000 [#1] SMP

    [ 853.454700] [<ffffffff81099f6a>] ? mod_timer+0x14a/0x220
    [ 853.455543] [<ffffffff81185465>] mempool_alloc_slab+0x15/0x20
    [ 853.456395] [<ffffffff811855a9>] mempool_alloc+0x69/0x170
    [ 853.457257] [<ffffffff81098af2>] ? internal_add_timer+0x32/0x70
    [ 853.458136] [<ffffffffc0092d2b>] qla2xxx_queuecommand+0x29b/0x3f0 [qla2xxx]
    [ 853.459024] [<ffffffff8146535a>] scsi_dispatch_cmd+0xaa/0x230
    [ 853.459923] [<ffffffff8146e11f>] scsi_request_fn+0x4df/0x680
    [ 853.460829] [<ffffffff81029557>] ? __switch_to+0xd7/0x510
    [ 853.461747] [<ffffffff812f7113>] __blk_run_queue+0x33/0x40
    [ 853.462670] [<ffffffff812f7735>] blk_delay_work+0x25/0x40
    [ 853.463603] [<ffffffff810a882a>] process_one_work+0x17a/0x440
    [ 853.464546] [<ffffffff810a94f6>] worker_thread+0x126/0x3c0
    [ 853.465501] [<ffffffff810a93d0>] ? manage_workers.isra.24+0x2a0/0x2a0
    [ 853.466447] [<ffffffff810b099f>] kthread+0xcf/0xe0
    [ 853.467379] [<ffffffff810b08d0>] ? insert_kthread_work+0x40/0x40
    [ 853.470172] Code: db e2 7e 49 8b 50 08 4d 8b 20 49 8b 40 10 4d 85 e4 0f 84 20
    01 00 00 48 85 c0 0f 84 17 01 00 00 49 63 46 20 48 8d 4a 01 4d 8b 06 <49> 8b 1c
    04 4c 89 e0 65 49 0f c7 08 0f 94 c0 84 c0 74 ba 49 63
    [ 853.472072] RIP [<ffffffff811df514>] kmem_cache_alloc+0x74/0x1e0
    [ 853.472971] RSP <ffff88103726fc50>

    Fixes: 726b85487067 ("qla2xxx: Add framework for async fabric discovery")
    Cc: <stable@vger.kernel.org>
    Signed-off-by: Giridhar Malavali <giridhar.malavali@cavium.com>
    Reviewed-by: Ewan D. Milne <emilne@redhat.com>
    Signed-off-by: Himanshu Madhani <himanshu.madhani@cavium.com>
    Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/scsi/qla2xxx/qla_gs.c | 3 +++
    drivers/scsi/qla2xxx/qla_init.c | 15 +++++++++++++--
    2 files changed, 16 insertions(+), 2 deletions(-)

    --- a/drivers/scsi/qla2xxx/qla_gs.c
    +++ b/drivers/scsi/qla2xxx/qla_gs.c
    @@ -3261,6 +3261,9 @@ static void qla24xx_async_gpsc_sp_done(v
    "Async done-%s res %x, WWPN %8phC \n",
    sp->name, res, fcport->port_name);

    + if (res == QLA_FUNCTION_TIMEOUT)
    + return;
    +
    if (res == (DID_ERROR << 16)) {
    /* entry status error */
    goto done;
    --- a/drivers/scsi/qla2xxx/qla_init.c
    +++ b/drivers/scsi/qla2xxx/qla_init.c
    @@ -52,12 +52,14 @@ qla2x00_sp_timeout(struct timer_list *t)
    struct srb_iocb *iocb;
    struct req_que *req;
    unsigned long flags;
    + struct qla_hw_data *ha = sp->vha->hw;

    - spin_lock_irqsave(sp->qpair->qp_lock_ptr, flags);
    + WARN_ON(irqs_disabled());
    + spin_lock_irqsave(&ha->hardware_lock, flags);
    req = sp->qpair->req;
    req->outstanding_cmds[sp->handle] = NULL;
    iocb = &sp->u.iocb_cmd;
    - spin_unlock_irqrestore(sp->qpair->qp_lock_ptr, flags);
    + spin_unlock_irqrestore(&ha->hardware_lock, flags);
    iocb->timeout(sp);
    }

    @@ -972,6 +974,15 @@ void qla24xx_async_gpdb_sp_done(void *s,

    fcport->flags &= ~(FCF_ASYNC_SENT | FCF_ASYNC_ACTIVE);

    + if (res == QLA_FUNCTION_TIMEOUT)
    + return;
    +
    + if (res == QLA_FUNCTION_TIMEOUT) {
    + dma_pool_free(sp->vha->hw->s_dma_pool, sp->u.iocb_cmd.u.mbx.in,
    + sp->u.iocb_cmd.u.mbx.in_dma);
    + return;
    + }
    +
    memset(&ea, 0, sizeof(ea));
    ea.event = FCME_GPDB_DONE;
    ea.fcport = fcport;

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