linux-kernel - [PATCH 4.19 045/114] ieee802154: atusb: fix use-after-free at disconnect

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Thu, 10 Oct 2019 10:35:52 +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, Alexander Aring <alex.aring@...il.com>,
        syzbot+f4509a9138a1472e7e80@...kaller.appspotmail.com,
        Johan Hovold <johan@...nel.org>,
        Stefan Schmidt <stefan@...enfreihafen.org>
Subject: [PATCH 4.19 045/114] ieee802154: atusb: fix use-after-free at disconnect

From: Johan Hovold <johan@...nel.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@...r.kernel.org>     # 4.2
Cc: Alexander Aring <alex.aring@...il.com>
Reported-by: syzbot+f4509a9138a1472e7e80@...kaller.appspotmail.com
Signed-off-by: Johan Hovold <johan@...nel.org>
Signed-off-by: Stefan Schmidt <stefan@...enfreihafen.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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__);
 }