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

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Message-Id: <20190311060541.16287-1-kjlu@umn.edu>
Date:   Mon, 11 Mar 2019 01:05:41 -0500
From:   Kangjie Lu <kjlu@....edu>
To:     kjlu@....edu
Cc:     pakki001@....edu, Sunil Goutham <sgoutham@...ium.com>,
        Robert Richter <rric@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        linux-arm-kernel@...ts.infradead.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] net: thunder: fix a potential NULL pointer dereference

In case alloc_ordered_workqueue fails, the fix reports the error
and returns -ENOMEM.

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

diff --git a/drivers/net/ethernet/cavium/thunder/nicvf_main.c b/drivers/net/ethernet/cavium/thunder/nicvf_main.c
index 503cfadff4ac..aa2be4807191 100644
--- a/drivers/net/ethernet/cavium/thunder/nicvf_main.c
+++ b/drivers/net/ethernet/cavium/thunder/nicvf_main.c
@@ -2234,6 +2234,12 @@ static int nicvf_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	nic->nicvf_rx_mode_wq = alloc_ordered_workqueue("nicvf_rx_mode_wq_VF%d",
 							WQ_MEM_RECLAIM,
 							nic->vf_id);
+	if (!nic->nicvf_rx_mode_wq) {
+		err = -ENOMEM;
+		dev_err(dev, "Failed to allocate work queue\n");
+		goto err_unregister_interrupts;
+	}
+
 	INIT_WORK(&nic->rx_mode_work.work, nicvf_set_rx_mode_task);
 	spin_lock_init(&nic->rx_mode_wq_lock);
 	mutex_init(&nic->rx_mode_mtx);
-- 
2.17.1