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xhci: Fix list corruption in urb dequeue at host removal

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xhci driver frees data for all devices, both usb2 and and usb3 the
first time usb_remove_hcd() is called, including td_list and and xhci_ring
structures.

When usb_remove_hcd() is called a second time for the second xhci bus it
will try to dequeue all pending urbs, and touches td_list which is already
freed for that endpoint.

Cc: <[email protected]>
Reported-by: Joe Lawrence <[email protected]>
Tested-by: Joe Lawrence <[email protected]>
Signed-off-by: Mathias Nyman <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Mathias Nyman 2016-01-26 17:50:12 +02:00 • committed by Greg Kroah-Hartman
commit 5c82171167
1 changed files with 3 additions and 1 deletions
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4
drivers/usb/host/xhci.c
View file

@ -1554,7 +1554,9 @@ int xhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb,
"HW died, freeing TD.");
urb_priv = urb->hcpriv;
for (i = urb_priv->td_cnt; i < urb_priv->length; i++) {
for (i = urb_priv->td_cnt;
i < urb_priv->length && xhci->devs[urb->dev->slot_id];
i++) {
td = urb_priv->td[i];
if (!list_empty(&td->td_list))
list_del_init(&td->td_list);