[PATCH 4.14 035/237] scsi: qla2xxx: fix a potential NULL pointer dereference

[Greg Kroah-Hartman]

From: Allen Pais <allen.pais@xxxxxxxxxx>

commit 35a79a63517981a8aea395497c548776347deda8 upstream.

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

Link: https://lore.kernel.org/r/1568824618-4366-1-git-send-email-allen.pais@xxxxxxxxxx
Signed-off-by: Allen Pais <allen.pais@xxxxxxxxxx>
Reviewed-by: Martin Wilck <mwilck@xxxxxxxx>
Acked-by: Himanshu Madhani <hmadhani@xxxxxxxxxxx>
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
[Ajay: Modified to apply on v4.14.y]
Signed-off-by: Ajay Kaher <akaher@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/scsi/qla2xxx/qla_os.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/scsi/qla2xxx/qla_os.c
+++ b/drivers/scsi/qla2xxx/qla_os.c
@@ -3178,6 +3178,10 @@ qla2x00_probe_one(struct pci_dev *pdev,
 	    base_vha->mgmt_svr_loop_id, host->sg_tablesize);
 
 	ha->wq = alloc_workqueue("qla2xxx_wq", WQ_MEM_RECLAIM, 0);
+	if (unlikely(!ha->wq)) {
+		ret = -ENOMEM;
+		goto probe_failed;
+	}
 
 	if (ha->mqenable) {
 		bool mq = false;