linux-kernel - [PATCH] net: fjes: fix potential NULL pointer dereferences

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Date:   Mon, 11 Mar 2019 02:10:21 -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] net: fjes: fix potential NULL pointer dereferences

In case alloc_workqueue fails, the fix returns -ENOMEM to avoid
ULL pointer dereferences.

Signed-off-by: Kangjie Lu <kjlu@....edu>
---
 drivers/net/fjes/fjes_main.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/net/fjes/fjes_main.c b/drivers/net/fjes/fjes_main.c
index d3eae1239045..18c2c9e24c24 100644
--- a/drivers/net/fjes/fjes_main.c
+++ b/drivers/net/fjes/fjes_main.c
@@ -1252,8 +1252,17 @@ 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_netdev;
+	}
 
 	INIT_WORK(&adapter->tx_stall_task, fjes_tx_stall_task);
 	INIT_WORK(&adapter->raise_intr_rxdata_task,
-- 
2.17.1