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usb: move children deallocation after quiescing the hub 

Commit ff823c79a5 ("usb: move children
to struct usb_port") forgot to consider the hub_disconnect sequence,
which releases ports before quiescing the hub, which will lead to a
use-after-free, since hub_quiesce() will try to disconnect ports'
children, which are already deallocated. Simple modprobe dummy_hcd &&
rmmod dummy_hcd will illustrate the problem.

This patch moves deallocation of hub's ports after hub_quiesce() call
in hub_disconnect().

Cc: Lan Tianyu <tianyu.lan@intel.com>
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alexander Shishkin 2012-09-12 14:48:31 +03:00 committed by Greg Kroah-Hartman
parent 58efc77c86
commit 1f2235b8e7
1 changed files with 3 additions and 3 deletions
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6
drivers/usb/core/hub.c
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@ -1584,9 +1584,6 @@ static void hub_disconnect(struct usb_interface *intf)
struct usb_device *hdev = interface_to_usbdev(intf);
int i;
for (i = 0; i < hdev->maxchild; i++)
usb_hub_remove_port_device(hub, i + 1);
/* Take the hub off the event list and don't let it be added again */
spin_lock_irq(&hub_event_lock);
if (!list_empty(&hub->event_list)) {
@ -1601,6 +1598,9 @@ static void hub_disconnect(struct usb_interface *intf)
hub_quiesce(hub, HUB_DISCONNECT);
usb_set_intfdata (intf, NULL);
for (i = 0; i < hdev->maxchild; i++)
usb_hub_remove_port_device(hub, i + 1);
hub->hdev->maxchild = 0;
if (hub->hdev->speed == USB_SPEED_HIGH)