Re: [PATCH] [SCSI] qla2xxx: qla2x00_probe_one kernel panic.

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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@xxxxxx>
---
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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