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

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Date:   Thu, 27 Feb 2020 14:34:09 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Allen Pais <allen.pais@...cle.com>,
        Martin Wilck <mwilck@...e.com>,
        Himanshu Madhani <hmadhani@...vell.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Ajay Kaher <akaher@...are.com>
Subject: [PATCH 4.14 035/237] scsi: qla2xxx: fix a potential NULL pointer dereference

From: Allen Pais <allen.pais@...cle.com>

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@oracle.com
Signed-off-by: Allen Pais <allen.pais@...cle.com>
Reviewed-by: Martin Wilck <mwilck@...e.com>
Acked-by: Himanshu Madhani <hmadhani@...vell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
[Ajay: Modified to apply on v4.14.y]
Signed-off-by: Ajay Kaher <akaher@...are.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 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;