linux-kernel - [PATCH 4.4 031/124] mwifiex: handle race during mwifiex_usb

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Message-Id: <20180804082703.604065023@linuxfoundation.org>
Date:   Sat,  4 Aug 2018 11:00:20 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Ganapathi Bhat <gbhat@...vell.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.4 031/124] mwifiex: handle race during mwifiex_usb_disconnect

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ganapathi Bhat <gbhat@...vell.com>

[ Upstream commit b817047ae70c0bd67b677b65d0d69d72cd6e9728 ]

Race condition is observed during rmmod of mwifiex_usb:

1. The rmmod thread will call mwifiex_usb_disconnect(), download
   SHUTDOWN command and do wait_event_interruptible_timeout(),
   waiting for response.

2. The main thread will handle the response and will do a
   wake_up_interruptible(), unblocking rmmod thread.

3. On getting unblocked, rmmod thread  will make rx_cmd.urb = NULL in
   mwifiex_usb_free().

4. The main thread will try to resubmit rx_cmd.urb in
   mwifiex_usb_submit_rx_urb(), which is NULL.

To fix, wait for main thread to complete before calling
mwifiex_usb_free().

Signed-off-by: Ganapathi Bhat <gbhat@...vell.com>
Signed-off-by: Kalle Valo <kvalo@...eaurora.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/wireless/mwifiex/usb.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/net/wireless/mwifiex/usb.c
+++ b/drivers/net/wireless/mwifiex/usb.c
@@ -624,6 +624,9 @@ static void mwifiex_usb_disconnect(struc
 					 MWIFIEX_FUNC_SHUTDOWN);
 	}

+	if (adapter->workqueue)
+		flush_workqueue(adapter->workqueue);
+
 	mwifiex_usb_free(card);

 	mwifiex_dbg(adapter, FATAL,