linux-kernel - [PATCH] net: ieee802154: fix a potential NULL pointer dereference

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Message-Id: <20190311072517.29740-1-kjlu@umn.edu>
Date:   Mon, 11 Mar 2019 02:25:17 -0500
From:   Kangjie Lu <kjlu@....edu>
To:     kjlu@....edu
Cc:     pakki001@....edu, Michael Hennerich <michael.hennerich@...log.com>,
        Alexander Aring <alex.aring@...il.com>,
        Stefan Schmidt <stefan@...enfreihafen.org>,
        "David S. Miller" <davem@...emloft.net>,
        linux-wpan@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] net: ieee802154: fix a potential NULL pointer dereference

In case alloc_ordered_workqueue fails, the fix releases
sources and returns -ENOMEM to avoid NULL pointer dereference.

Signed-off-by: Kangjie Lu <kjlu@....edu>
---
 drivers/net/ieee802154/adf7242.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ieee802154/adf7242.c b/drivers/net/ieee802154/adf7242.c
index cd1d8faccca5..cd6b95e673a5 100644
--- a/drivers/net/ieee802154/adf7242.c
+++ b/drivers/net/ieee802154/adf7242.c
@@ -1268,6 +1268,10 @@ static int adf7242_probe(struct spi_device *spi)
 	INIT_DELAYED_WORK(&lp->work, adf7242_rx_cal_work);
 	lp->wqueue = alloc_ordered_workqueue(dev_name(&spi->dev),
 					     WQ_MEM_RECLAIM);
+	if (unlikely(!lp->wqueue)) {
+		ret = -ENOMEM;
+		goto err_hw_init;
+	}
 
 	ret = adf7242_hw_init(lp);
 	if (ret)
-- 
2.17.1