scsi: qla2xxx: fix a potential NULL pointer dereference

[ Upstream commit 35a79a6 ]

alloc_workqueue is not checked for errors and as a result a potential
NULL dereference could occur.

Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Allen Pais <[email protected]>
Reviewed-by: Martin Wilck <[email protected]>
Acked-by: Himanshu Madhani <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
(cherry picked from commit 3ee6a8bdae81a09c1dc9c27d3a50e6b1b6a24676)

Orabug: 30618782
CVE: CVE-2019-16233

Signed-off-by: Larry Bassel <[email protected]>
Reviewed-by:  John Donnelly <[email protected]>
Signed-off-by: Somasundaram Krishnasamy <[email protected]>

Author: Allen Pais

drivers/scsi/qla2xxx/qla_os.c

@@ -3287,6 +3287,10 @@ qla2x00_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
 	    "req->req_q_in=%p req->req_q_out=%p rsp->rsp_q_in=%p rsp->rsp_q_out=%p.\n",
 	    req->req_q_in, req->req_q_out, rsp->rsp_q_in, rsp->rsp_q_out);
 	ha->wq = alloc_workqueue("qla2xxx_wq", 0, 0);
+	if (unlikely(!ha->wq)) {
+		ret = -ENOMEM;
+		goto probe_failed;
+	}
 
 	if (ha->isp_ops->initialize_adapter(base_vha)) {
 		ql_log(ql_log_fatal, base_vha, 0x00d6,