netdev - Re: [PATCH] net: rtlwifi: fix a potential NULL pointer dereference

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Date:   Fri, 22 Mar 2019 22:59:53 -0500
From:   Kangjie Lu <kjlu@....edu>
To:     kjlu@....edu
Cc:     pakki001@....edu, Ping-Ke Shih <pkshih@...ltek.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: rtlwifi: fix a potential NULL pointer dereference



> On Mar 12, 2019, at 2:56 AM, Kangjie Lu <kjlu@....edu> wrote:
> 
> In case alloc_workqueue fails, the fix reports the error and
> returns to avoid NULL pointer dereference.
> 
> Signed-off-by: Kangjie Lu <kjlu@....edu>
> ---
> 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;
> +	}
> +

Can someone review the patch?

Thanks.

> 	INIT_DELAYED_WORK(&rtlpriv->works.watchdog_wq,
> 			  (void *)rtl_watchdog_wq_callback);
> 	INIT_DELAYED_WORK(&rtlpriv->works.ips_nic_off_wq,
> -- 
> 2.17.1
>