linux-kernel - [PATCH] drivers/net/fjes: fix a potential NULL pointer dereference

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Message-Id: <1568824395-4162-1-git-send-email-allen.pais@oracle.com>
Date:   Wed, 18 Sep 2019 22:03:15 +0530
From:   Allen Pais <allen.pais@...cle.com>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, linux-kernel@...r.kernel.org
Subject: [PATCH] drivers/net/fjes: fix a potential NULL pointer dereference

alloc_workqueue is not checked for errors and as a result,
a potential NULL dereference could occur.

Signed-off-by: Allen Pais <allen.pais@...cle.com>
---
 drivers/net/fjes/fjes_main.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/net/fjes/fjes_main.c b/drivers/net/fjes/fjes_main.c
index bbbc1dc..2d04104 100644
--- a/drivers/net/fjes/fjes_main.c
+++ b/drivers/net/fjes/fjes_main.c
@@ -1237,8 +1237,15 @@ 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 (unlikely(!adapter->txrx_wq))
+		goto err_free_netdev;
+
 	adapter->control_wq = alloc_workqueue(DRV_NAME "/control",
 					      WQ_MEM_RECLAIM, 0);
+	if (unlikely(!adapter->control_wq)) {
+		destroy_workqueue(adapter->txrx_wq);
+		goto err_free_netdev;
+	}
 
 	INIT_WORK(&adapter->tx_stall_task, fjes_tx_stall_task);
 	INIT_WORK(&adapter->raise_intr_rxdata_task,
-- 
1.9.1