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

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>
This commit is contained in:
Oliver Neukum 2017-03-14 12:05:07 +01:00 committed by Greg Kroah-Hartman
parent e4ecd155d2
commit c4ba329cab
1 changed files with 1 additions and 0 deletions
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1
drivers/usb/misc/lvstest.c
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@ -429,6 +429,7 @@ static void lvs_rh_disconnect(struct usb_interface *intf)
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);
}