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scsi: qla2xxx: Fix crashes in qla2x00_probe_one on probe failure

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commit 6a2cf8d366 upstream.

Because of the shifting around of code in qla2x00_probe_one recently,
failures during adapter initialization can lead to problems, i.e. NULL
pointer crashes and doubly freed data structures which cause eventual
panics.

This V2 version makes the relevant memory free routines idempotent, so
repeat calls won't cause any harm. I also removed the problematic
probe_init_failed exit point as it is not needed.

Fixes: d64d6c5671 ("scsi: qla2xxx: Fix NULL pointer crash due to probe failure")
Signed-off-by: Bill Kuzeja <william.kuzeja@stratus.com>
Acked-by: Himanshu Madhani <himanshu.madhani@cavium.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Bill Kuzeja 2018-03-05 00:02:55 -05:00 committed by Greg Kroah-Hartman
parent 91cb90636e
commit c209d68794
1 changed files with 37 additions and 22 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

59
drivers/scsi/qla2xxx/qla_os.c
View file

@ -442,7 +442,7 @@ static int qla2x00_alloc_queues(struct qla_hw_data *ha, struct req_que *req,
ha->req_q_map[0] = req;
set_bit(0, ha->rsp_qid_map);
set_bit(0, ha->req_qid_map);
return 1;
return 0;
fail_qpair_map:
kfree(ha->base_qpair);
@ -459,6 +459,9 @@ static int qla2x00_alloc_queues(struct qla_hw_data *ha, struct req_que *req,
static void qla2x00_free_req_que(struct qla_hw_data *ha, struct req_que *req)
{
if (!ha->req_q_map)
return;
if (IS_QLAFX00(ha)) {
if (req && req->ring_fx00)
dma_free_coherent(&ha->pdev->dev,
@ -469,14 +472,17 @@ static void qla2x00_free_req_que(struct qla_hw_data *ha, struct req_que *req)
(req->length + 1) * sizeof(request_t),
req->ring, req->dma);
if (req)
if (req) {
kfree(req->outstanding_cmds);
kfree(req);
kfree(req);
}
}
static void qla2x00_free_rsp_que(struct qla_hw_data *ha, struct rsp_que *rsp)
{
if (!ha->rsp_q_map)
return;
if (IS_QLAFX00(ha)) {
if (rsp && rsp->ring)
dma_free_coherent(&ha->pdev->dev,
@ -487,7 +493,8 @@ static void qla2x00_free_rsp_que(struct qla_hw_data *ha, struct rsp_que *rsp)
(rsp->length + 1) * sizeof(response_t),
rsp->ring, rsp->dma);
}
kfree(rsp);
if (rsp)
kfree(rsp);
}
static void qla2x00_free_queues(struct qla_hw_data *ha)
@ -1710,6 +1717,8 @@ qla2x00_abort_all_cmds(scsi_qla_host_t *vha, int res)
struct qla_tgt_cmd *cmd;
uint8_t trace = 0;
if (!ha->req_q_map)
return;
spin_lock_irqsave(&ha->hardware_lock, flags);
for (que = 0; que < ha->max_req_queues; que++) {
req = ha->req_q_map[que];
@ -3063,14 +3072,14 @@ 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_hw_failed;
goto probe_failed;
/* Alloc arrays of request and response ring ptrs */
if (!qla2x00_alloc_queues(ha, req, rsp)) {
if (qla2x00_alloc_queues(ha, req, rsp)) {
ql_log(ql_log_fatal, base_vha, 0x003d,
"Failed to allocate memory for queue pointers..."
"aborting.\n");
goto probe_init_failed;
goto probe_failed;
}
if (ha->mqenable && shost_use_blk_mq(host)) {
@ -3347,15 +3356,6 @@ qla2x00_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
return 0;
probe_init_failed:
qla2x00_free_req_que(ha, req);
ha->req_q_map[0] = NULL;
clear_bit(0, ha->req_qid_map);
qla2x00_free_rsp_que(ha, rsp);
ha->rsp_q_map[0] = NULL;
clear_bit(0, ha->rsp_qid_map);
ha->max_req_queues = ha->max_rsp_queues = 0;
probe_failed:
if (base_vha->timer_active)
qla2x00_stop_timer(base_vha);
@ -4435,11 +4435,17 @@ qla2x00_mem_free(struct qla_hw_data *ha)
if (ha->init_cb)
dma_free_coherent(&ha->pdev->dev, ha->init_cb_size,
ha->init_cb, ha->init_cb_dma);
vfree(ha->optrom_buffer);
kfree(ha->nvram);
kfree(ha->npiv_info);
kfree(ha->swl);
kfree(ha->loop_id_map);
if (ha->optrom_buffer)
vfree(ha->optrom_buffer);
if (ha->nvram)
kfree(ha->nvram);
if (ha->npiv_info)
kfree(ha->npiv_info);
if (ha->swl)
kfree(ha->swl);
if (ha->loop_id_map)
kfree(ha->loop_id_map);
ha->srb_mempool = NULL;
ha->ctx_mempool = NULL;
@ -4455,6 +4461,15 @@ qla2x00_mem_free(struct qla_hw_data *ha)
ha->ex_init_cb_dma = 0;
ha->async_pd = NULL;
ha->async_pd_dma = 0;
ha->loop_id_map = NULL;
ha->npiv_info = NULL;
ha->optrom_buffer = NULL;
ha->swl = NULL;
ha->nvram = NULL;
ha->mctp_dump = NULL;
ha->dcbx_tlv = NULL;
ha->xgmac_data = NULL;
ha->sfp_data = NULL;
ha->s_dma_pool = NULL;
ha->dl_dma_pool = NULL;