linux-kernel - Re: [PATCH] [SCSI] qla2xxx: qla2x00_probe

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Date:	Thu, 3 May 2012 07:38:06 -0400
From:	Chad Dupuis <chad.dupuis@...gic.com>
To:	Jerry Hoemann <jerry.hoemann@...com>
CC:	"JBottomley@...allels.com" <JBottomley@...allels.com>,
	Andrew Vasquez <andrew.vasquez@...gic.com>,
	Dept-Eng Linux Driver <Linux-Driver@...gic.com>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] [SCSI] qla2xxx: qla2x00_probe_one kernel panic.



On Wed, 2 May 2012, Jerry Hoemann wrote:

> When qla2x00_probe_one fails, its back-out logic tries to free up
> resources already allocated.
>
> When qla2x00_probe_one fails at the steps for qla2x00_request_irqs
> or qla2x00_alloc_queues, it will call qla2x00_free_device.  This
> path eventually calls qla2x00_free_irqs which accesses ha->rsp_q_map.
> However, the rsp_q_map pointer hasn't been initialized yet.
>
> This causes a "NULL pointer dereference" panic.
>
> Signed-off-by: Jerry Hoemann <jerry.hoemann@...com>
> ---
> drivers/scsi/qla2xxx/qla_os.c |    9 ++-------
> 1 files changed, 2 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c
> index a2f9992..7aeb5aa 100644
> --- a/drivers/scsi/qla2xxx/qla_os.c
> +++ b/drivers/scsi/qla2xxx/qla_os.c
> @@ -2420,7 +2420,7 @@ qla2x00_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
>       /* Set up the irqs */
>       ret = qla2x00_request_irqs(ha, rsp);
>       if (ret)
> -             goto probe_init_failed;
> +             goto probe_hw_failed;
>
>       pci_save_state(pdev);
>
> @@ -2429,7 +2429,7 @@ que_init:
>       if (!qla2x00_alloc_queues(ha)) {
>               ql_log(ql_log_fatal, base_vha, 0x003d,
>                   "Failed to allocate memory for queue pointers.. aborting.\n");
> -             goto probe_init_failed;
> +             goto probe_hw_failed;
>       }
>
>       ha->rsp_q_map[0] = rsp;
> @@ -2579,11 +2579,6 @@ skip_dpc:
>
>       return 0;
>
> -probe_init_failed:
> -     qla2x00_free_req_que(ha, req);
> -     qla2x00_free_rsp_que(ha, rsp);
> -     ha->max_req_queues = ha->max_rsp_queues = 0;
> -
> probe_failed:
>       if (base_vha->timer_active)
>               qla2x00_stop_timer(base_vha);
>

Hi Jerry,

Thanks for the patch.  We'll be sending a patch that fixes this issue soon
to the list.

--Chad

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