This is a note to let you know that I've just added the patch titled

usb: misc: lvs: fix race condition in disconnect handling

to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: usb-misc-lvs-fix-race-condition-in-disconnect-handling.patch and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From foo@baz Sun Mar 18 16:55:33 CET 2018

From: Oliver Neukum oneukum@suse.com Date: Tue, 14 Mar 2017 12:05:07 +0100 Subject: usb: misc: lvs: fix race condition in disconnect handling

From: Oliver Neukum oneukum@suse.com

[ Upstream commit c4ba329cabca7c839ab48fb58b5bcc2582951a48 ]

There is a small window during which the an URB may remain active after disconnect has returned. If in that case already freed memory may be accessed and executed.

The fix is to poison the URB befotre the work is flushed.

Signed-off-by: Oliver Neukum oneukum@suse.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/misc/lvstest.c | 1 + 1 file changed, 1 insertion(+)

--- a/drivers/usb/misc/lvstest.c +++ b/drivers/usb/misc/lvstest.c @@ -433,6 +433,7 @@ static void lvs_rh_disconnect(struct usb struct lvs_rh *lvs = usb_get_intfdata(intf);

sysfs_remove_group(&intf->dev.kobj, &lvs_attr_group); + usb_poison_urb(lvs->urb); /* used in scheduled work */ flush_work(&lvs->rh_work); usb_free_urb(lvs->urb); }

Patches currently in stable-queue which might be from oneukum@suse.com are

queue-4.9/usb-misc-lvs-fix-race-condition-in-disconnect-handling.patch