linux-kernel - [PATCH] net: cw1200: fix a NULL pointer dereference

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Message-Id: <20190312080502.2953-1-kjlu@umn.edu>
Date:   Tue, 12 Mar 2019 03:05:02 -0500
From:   Kangjie Lu <kjlu@....edu>
To:     kjlu@....edu
Cc:     pakki001@....edu, Solomon Peachy <pizza@...ftnet.org>,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] net: cw1200: fix a NULL pointer dereference

In case create_singlethread_workqueue fails, the fix free the
hardware and returns NULL to avoid NULL pointer dereference.

Signed-off-by: Kangjie Lu <kjlu@....edu>
---
 drivers/net/wireless/st/cw1200/main.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/wireless/st/cw1200/main.c b/drivers/net/wireless/st/cw1200/main.c
index 90dc979f260b..c1608f0bf6d0 100644
--- a/drivers/net/wireless/st/cw1200/main.c
+++ b/drivers/net/wireless/st/cw1200/main.c
@@ -345,6 +345,11 @@ static struct ieee80211_hw *cw1200_init_common(const u8 *macaddr,
 	mutex_init(&priv->wsm_cmd_mux);
 	mutex_init(&priv->conf_mutex);
 	priv->workqueue = create_singlethread_workqueue("cw1200_wq");
+	if (!priv->workqueue) {
+		ieee80211_free_hw(hw);
+		return NULL;
+	}
+
 	sema_init(&priv->scan.lock, 1);
 	INIT_WORK(&priv->scan.work, cw1200_scan_work);
 	INIT_DELAYED_WORK(&priv->scan.probe_work, cw1200_probe_work);
-- 
2.17.1