From 42d1abb50ffc51c65e9cec735c8a9711296a05f7 Mon Sep 17 00:00:00 2001
From: Xinming Hu <huxm@marvell.com>
Date: Tue, 23 May 2017 07:12:31 +0000
Subject: [PATCH] mwifiex: usb: kill urb before free its memory
Git-commit: 42d1abb50ffc51c65e9cec735c8a9711296a05f7
Patch-mainline: v4.13-rc1
References: FATE#326294

we have observed host system hang when device firmware crash,
stack trace show it was an use-after-free case: previous submitted
urb will be holding in usbcore, and given back to device driver
when device disconnected, while the urb have been freed in usb
device disconnect handler. This patch kill the holding urb before
free its memory.

Signed-off-by: Xinming Hu <huxm@marvell.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/net/wireless/marvell/mwifiex/usb.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/wireless/marvell/mwifiex/usb.c b/drivers/net/wireless/marvell/mwifiex/usb.c
index debd6216366a..9c3d654ae009 100644
--- a/drivers/net/wireless/marvell/mwifiex/usb.c
+++ b/drivers/net/wireless/marvell/mwifiex/usb.c
@@ -363,6 +363,7 @@ static void mwifiex_usb_free(struct usb_card_rec *card)
 	for (i = 0; i < MWIFIEX_TX_DATA_PORT; i++) {
 		port = &card->port[i];
 		for (j = 0; j < MWIFIEX_TX_DATA_URB; j++) {
+			usb_kill_urb(port->tx_data_list[j].urb);
 			usb_free_urb(port->tx_data_list[j].urb);
 			port->tx_data_list[j].urb = NULL;
 		}
-- 
2.19.2