linux-kernel - [PATCH v2] net: qlogic: fix a potential NULL pointer dereference

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Message-Id: <20190312070647.20844-1-kjlu@umn.edu>
Date:   Tue, 12 Mar 2019 02:06:47 -0500
From:   Kangjie Lu <kjlu@....edu>
To:     kjlu@....edu
Cc:     pakki001@....edu, GR-Linux-NIC-Dev@...vell.com,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2] net: qlogic: fix a potential NULL pointer dereference

In case create_singlethread_workqueue fails, the fix returns
-ENOMEM to avoid NULL pointer dereference.

Signed-off-by: Kangjie Lu <kjlu@....edu>
---
 drivers/net/ethernet/qlogic/qla3xxx.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/ethernet/qlogic/qla3xxx.c b/drivers/net/ethernet/qlogic/qla3xxx.c
index 10b075bc5959..b61b88cbc0c7 100644
--- a/drivers/net/ethernet/qlogic/qla3xxx.c
+++ b/drivers/net/ethernet/qlogic/qla3xxx.c
@@ -3886,6 +3886,12 @@ static int ql3xxx_probe(struct pci_dev *pdev,
 	netif_stop_queue(ndev);
 
 	qdev->workqueue = create_singlethread_workqueue(ndev->name);
+	if (!qdev->workqueue) {
+		unregister_netdev(ndev);
+		err = -ENOMEM;
+		goto err_out_iounmap;
+	}
+
 	INIT_DELAYED_WORK(&qdev->reset_work, ql_reset_work);
 	INIT_DELAYED_WORK(&qdev->tx_timeout_work, ql_tx_timeout_work);
 	INIT_DELAYED_WORK(&qdev->link_state_work, ql_link_state_machine_work);
-- 
2.17.1