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Subject[PATCH 4.19 045/114] ieee802154: atusb: fix use-after-free at disconnect
Date
From: Johan Hovold <johan@kernel.org>

commit 7fd25e6fc035f4b04b75bca6d7e8daa069603a76 upstream.

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 <stable@vger.kernel.org> # 4.2
Cc: Alexander Aring <alex.aring@gmail.com>
Reported-by: syzbot+f4509a9138a1472e7e80@syzkaller.appspotmail.com
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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

--- a/drivers/net/ieee802154/atusb.c
+++ b/drivers/net/ieee802154/atusb.c
@@ -1140,10 +1140,11 @@ static void atusb_disconnect(struct usb_

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__);
}

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