releases/4.4.181/rtlwifi-fix-a-potential-null-pointer-dereference.patch

   1 From efe49bfc86f78ad7c1514843b5c699783dc8724a Mon Sep 17 00:00:00 2001
   2 From: Kangjie Lu <kjlu@umn.edu>
   3 Date: Tue, 12 Mar 2019 02:56:33 -0500
   4 Subject: rtlwifi: fix a potential NULL pointer dereference
   5
   6 [ Upstream commit 765976285a8c8db3f0eb7f033829a899d0c2786e ]
   7
   8 In case alloc_workqueue fails, the fix reports the error and
   9 returns to avoid NULL pointer dereference.
  10
  11 Signed-off-by: Kangjie Lu <kjlu@umn.edu>
  12 Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
  13 Signed-off-by: Sasha Levin <sashal@kernel.org>
  14 ---
  15  drivers/net/wireless/realtek/rtlwifi/base.c | 5 +++++
  16  1 file changed, 5 insertions(+)
  17
  18 diff --git a/drivers/net/wireless/realtek/rtlwifi/base.c b/drivers/net/wireless/realtek/rtlwifi/base.c
  19 index aab752328c269..5013d8c1d4a60 100644
  20 --- a/drivers/net/wireless/realtek/rtlwifi/base.c
  21 +++ b/drivers/net/wireless/realtek/rtlwifi/base.c
  22 @@ -466,6 +466,11 @@ static void _rtl_init_deferred_work(struct ieee80211_hw *hw)
  23         /* <2> work queue */
  24         rtlpriv->works.hw = hw;
  25         rtlpriv->works.rtl_wq = alloc_workqueue("%s", 0, 0, rtlpriv->cfg->name);
  26 +       if (unlikely(!rtlpriv->works.rtl_wq)) {
  27 +               pr_err("Failed to allocate work queue\n");
  28 +               return;
  29 +       }
  30 +
  31         INIT_DELAYED_WORK(&rtlpriv->works.watchdog_wq,
  32                           (void *)rtl_watchdog_wq_callback);
  33         INIT_DELAYED_WORK(&rtlpriv->works.ips_nic_off_wq,
  34 --
  35 2.20.1
  36