Subject: [PATCH] ieee802154: atusb: fix use-after-free at disconnect

From: Johan Hovold <[email-masked]>
Date: Thu, 19 Sep 2019 14:12:34 +0200

The disconnect callback was accessing the hardware-descriptor private
data after having having freed it.

Fixes: 7490b008d123 ("ieee802154: add support for atusb transceiver")
Cc: stable <[email-masked]>     # 4.2
Cc: Alexander Aring <[email-masked]>
Reported-by: [email-masked]
Signed-off-by: Johan Hovold <[email-masked]>
---

#syz test: https://github.com/google/kasan.git f0df5c1b

 drivers/net/ieee802154/atusb.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ieee802154/atusb.c b/drivers/net/ieee802154/atusb.c
index ceddb424f887..0dd0ba915ab9 100644
--- a/drivers/net/ieee802154/atusb.c
+++ b/drivers/net/ieee802154/atusb.c
@@ -1137,10 +1137,11 @@ static void atusb_disconnect(struct usb_interface *interface)
 
 	ieee802154_unregister_hw(atusb->hw);
 
+	usb_put_dev(atusb->usb_dev);
+
 	ieee802154_free_hw(atusb->hw);
 
 	usb_set_intfdata(interface, NULL);
-	usb_put_dev(atusb->usb_dev);
 
 	pr_debug("%s done\n", __func__);
 }
-- 
2.23.0