[PATCH 4.14 139/193] rtlwifi: fix a potential NULL pointer dereference

[Greg Kroah-Hartman]

[ Upstream commit 765976285a8c8db3f0eb7f033829a899d0c2786e ]

In case alloc_workqueue fails, the fix reports the error and
returns to avoid NULL pointer dereference.

Signed-off-by: Kangjie Lu <k...@umn.edu>
Signed-off-by: Kalle Valo <kv...@codeaurora.org>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 drivers/net/wireless/realtek/rtlwifi/base.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/wireless/realtek/rtlwifi/base.c 
b/drivers/net/wireless/realtek/rtlwifi/base.c
index ec82c1c3f12e4..4a3c713ad3247 100644
--- a/drivers/net/wireless/realtek/rtlwifi/base.c
+++ b/drivers/net/wireless/realtek/rtlwifi/base.c
@@ -468,6 +468,11 @@ static void _rtl_init_deferred_work(struct ieee80211_hw 
*hw)
        /* <2> work queue */
        rtlpriv->works.hw = hw;
        rtlpriv->works.rtl_wq = alloc_workqueue("%s", 0, 0, rtlpriv->cfg->name);
+       if (unlikely(!rtlpriv->works.rtl_wq)) {
+               pr_err("Failed to allocate work queue\n");
+               return;
+       }
+
        INIT_DELAYED_WORK(&rtlpriv->works.watchdog_wq,
                          (void *)rtl_watchdog_wq_callback);
        INIT_DELAYED_WORK(&rtlpriv->works.ips_nic_off_wq,
-- 
2.20.1