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[128.101.106.63]) by smtp.gmail.com with ESMTPSA id s10sm2669419ioc.54.2019.03.12.00.56.38 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 12 Mar 2019 00:56:38 -0700 (PDT) From: Kangjie Lu To: kjlu@umn.edu Cc: pakki001@umn.edu, Ping-Ke Shih , Kalle Valo , "David S. Miller" , linux-wireless@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] net: rtlwifi: fix a potential NULL pointer dereference Date: Tue, 12 Mar 2019 02:56:33 -0500 Message-Id: <20190312075633.573-1-kjlu@umn.edu> X-Mailer: git-send-email 2.17.1 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org In case alloc_workqueue fails, the fix reports the error and returns to avoid NULL pointer dereference. Signed-off-by: Kangjie Lu --- 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 217d2a7a43c7..ac746c322554 100644 --- a/drivers/net/wireless/realtek/rtlwifi/base.c +++ b/drivers/net/wireless/realtek/rtlwifi/base.c @@ -448,6 +448,11 @@ 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, -- 2.17.1