linux-kernel - [PATCH] Net/Usb:Fix realtek wireless NIC non-canonical address access issues

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Date:   Tue, 20 Oct 2020 19:38:59 +0800
From:   WeitaoWangoc <WeitaoWang-oc@...oxin.com>
To:     <pkshih@...ltek.com>, <kvalo@...eaurora.org>,
        <davem@...emloft.net>, <kuba@...nel.org>,
        <linux-wireless@...r.kernel.org>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     <tonywwang@...oxin.com>, <weitaowang@...oxin.com>,
        <CobeChen@...oxin.com>, <TimGuo@...oxin.com>, <wwt8723@....com>
Subject: [PATCH] Net/Usb:Fix realtek wireless NIC non-canonical address access issues

During realtek USB wireless NIC initialization, it's unexpected
disconnection will cause urb sumbmit fail.On the one hand,
_rtl_usb_cleanup_rx will be called to clean up rx stuff, especially
for rtl_wq. On the other hand, disconnection will cause rtl_usb_disconnect
and _rtl_usb_cleanup_rx to be called.Finnally,rtl_wq will be flush/destroy
twice,which will cause non-canonical address 0xdead000000000122 access and
general protection fault.

Fixed this issue by remove _rtl_usb_cleanup_rx when urb sumbmit fail.

Signed-off-by: WeitaoWangoc <WeitaoWang-oc@...oxin.com>
---
 drivers/net/wireless/realtek/rtlwifi/usb.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/net/wireless/realtek/rtlwifi/usb.c b/drivers/net/wireless/realtek/rtlwifi/usb.c
index 06e073d..d62b87f 100644
--- a/drivers/net/wireless/realtek/rtlwifi/usb.c
+++ b/drivers/net/wireless/realtek/rtlwifi/usb.c
@@ -731,7 +731,6 @@ static int _rtl_usb_receive(struct ieee80211_hw *hw)

 err_out:
 	usb_kill_anchored_urbs(&rtlusb->rx_submitted);
-	_rtl_usb_cleanup_rx(hw);
 	return err;
 }

-- 
2.7.4