rtlwifi: fix a potential NULL pointer dereference

[ 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 <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/realtek/rtlwifi/base.c b/drivers/net/wireless/realtek/rtlwifi/base.c
index ef9b502..a318929 100644 (file)
--- a/drivers/net/wireless/realtek/rtlwifi/base.c
+++ b/drivers/net/wireless/realtek/rtlwifi/base.c
@@ -469,6 +469,11 @@ 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,