linux-kernel - Re: [PATCH] staging: rtl8192e: Fix potential use-after-free in rtllib_rx

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Date:   Wed, 23 Nov 2022 22:26:52 +0100
From:   Philipp Hortmann <philipp.g.hortmann@...il.com>
To:     YueHaibing <yuehaibing@...wei.com>, gregkh@...uxfoundation.org,
        wlanfae@...ltek.com, Larry.Finger@...inger.net, mikem@...g3k.org
Cc:     linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: rtl8192e: Fix potential use-after-free in
 rtllib_rx_Monitor()

On 11/23/22 09:12, YueHaibing wrote:
> The skb is delivered to netif_rx() in rtllib_monitor_rx(), which may free it,
> after calling this, dereferencing skb may trigger use-after-free.
> Found by Smatch.
> 
> Fixes: 94a799425eee ("From: wlanfae <wlanfae@...ltek.com> [PATCH 1/8] rtl8192e: Import new version of driver from realtek")
> Signed-off-by: YueHaibing <yuehaibing@...wei.com>
> ---
>   drivers/staging/rtl8192e/rtllib_rx.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/rtl8192e/rtllib_rx.c b/drivers/staging/rtl8192e/rtllib_rx.c
> index 6a0f5bbb99ef..f8965afab767 100644
> --- a/drivers/staging/rtl8192e/rtllib_rx.c
> +++ b/drivers/staging/rtl8192e/rtllib_rx.c
> @@ -1489,9 +1489,9 @@ static int rtllib_rx_Monitor(struct rtllib_device *ieee, struct sk_buff *skb,
>   		hdrlen += 4;
>   	}
>   
> -	rtllib_monitor_rx(ieee, skb, rx_stats, hdrlen);
>   	ieee->stats.rx_packets++;
>   	ieee->stats.rx_bytes += skb->len;
> +	rtllib_monitor_rx(ieee, skb, rx_stats, hdrlen);
>   
>   	return 1;
>   }

I was able to set the driver to Monitor mode but I did not get any 
information from it. I think this happens due to the missing support for 
nl80211. Please give me a hint how to do this.

Thanks for your support.

Bye Philipp