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xhci: Fix NULL pointer dereference in xhci_clear_tt_buffer_complete()

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udev stored in ep->hcpriv might be NULL if tt buffer is cleared
due to a halted control endpoint during device enumeration

xhci_clear_tt_buffer_complete is called by hub_tt_work() once it's
scheduled,  and by then usb core might have freed and allocated a
new udev for the next enumeration attempt.

Fixes: ef513be0a9 ("usb: xhci: Add Clear_TT_Buffer")
Cc: <stable@vger.kernel.org> # v5.3
Reported-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/1570190373-30684-9-git-send-email-mathias.nyman@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mathias Nyman 2019-10-04 14:59:33 +03:00 committed by Greg Kroah-Hartman
parent ac34336684
commit cfbb8a84c2
1 changed files with 8 additions and 0 deletions
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8
drivers/usb/host/xhci.c
View file

@ -5238,8 +5238,16 @@ static void xhci_clear_tt_buffer_complete(struct usb_hcd *hcd,
unsigned int ep_index;
unsigned long flags;
/*
* udev might be NULL if tt buffer is cleared during a failed device
* enumeration due to a halted control endpoint. Usb core might
* have allocated a new udev for the next enumeration attempt.
*/
xhci = hcd_to_xhci(hcd);
udev = (struct usb_device *)ep->hcpriv;
if (!udev)
return;
slot_id = udev->slot_id;
ep_index = xhci_get_endpoint_index(&ep->desc);