net: cw1200: fix a NULL pointer dereference

[ Upstream commit 0ed2a005347400500a39ea7c7318f1fea57fb3ca ]

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@umn.edu>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/wireless/st/cw1200/main.c b/drivers/net/wireless/st/cw1200/main.c
index dc478ce..84624c8 100644 (file)
--- 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);