netdev - [PATCH v2] net: fjes: fix potential NULL pointer dereferences

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Message-Id: <20190323035223.23714-1-kjlu@umn.edu>
Date:   Fri, 22 Mar 2019 22:52:21 -0500
From:   Kangjie Lu <kjlu@....edu>
To:     kjlu@....edu
Cc:     pakki001@....edu, "David S. Miller" <davem@...emloft.net>,
        Colin Ian King <colin.king@...onical.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2] net: fjes: fix potential NULL pointer dereferences

In case alloc_workqueue fails, the patch returns -ENOMEM to avoid
NULL pointer dereferences.

In addition, the patch fixes memory-leak issues.

Signed-off-by: Kangjie Lu <kjlu@....edu>

---
V2: free resources properly
---
 drivers/net/fjes/fjes_main.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/drivers/net/fjes/fjes_main.c b/drivers/net/fjes/fjes_main.c
index d3eae1239045..471486eefb7b 100644
--- a/drivers/net/fjes/fjes_main.c
+++ b/drivers/net/fjes/fjes_main.c
@@ -1252,8 +1252,16 @@ static int fjes_probe(struct platform_device *plat_dev)
 	adapter->open_guard = false;
 
 	adapter->txrx_wq = alloc_workqueue(DRV_NAME "/txrx", WQ_MEM_RECLAIM, 0);
+	if (!adapter->txrx_wq) {
+		err = -ENOMEM;
+		goto err_free_netdev;
+	}
 	adapter->control_wq = alloc_workqueue(DRV_NAME "/control",
 					      WQ_MEM_RECLAIM, 0);
+	if (!adapter->control_wq) {
+		err = -ENOMEM;
+		goto err_free_wq;
+	}
 
 	INIT_WORK(&adapter->tx_stall_task, fjes_tx_stall_task);
 	INIT_WORK(&adapter->raise_intr_rxdata_task,
@@ -1270,7 +1278,7 @@ static int fjes_probe(struct platform_device *plat_dev)
 	hw->hw_res.irq = platform_get_irq(plat_dev, 0);
 	err = fjes_hw_init(&adapter->hw);
 	if (err)
-		goto err_free_netdev;
+		goto err_free_wq;
 
 	/* setup MAC address (02:00:00:00:00:[epid])*/
 	netdev->dev_addr[0] = 2;
@@ -1292,6 +1300,11 @@ static int fjes_probe(struct platform_device *plat_dev)
 
 err_hw_exit:
 	fjes_hw_exit(&adapter->hw);
+err_free_wq:
+	if (adapter->txrx_wq)
+		destroy_workqueue(adapter->txrx_wq);
+	if (adapter->control_wq)
+		destroy_workqueue(adapter->control_wq);
 err_free_netdev:
 	free_netdev(netdev);
 err_out:
-- 
2.17.1