diff options
| author | Mathias Nyman | 2019-10-04 14:59:33 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman | 2019-10-04 14:32:12 +0200 |
| commit | cfbb8a84c2d2ef49bccacb511002bca4f6053555 (patch) | |
| tree | 9d1026266cf639881ec85127cc7a4585a239d85a /drivers/usb/host | |
| parent | ac343366846a445bb81f0a0e8f16abb8bd5d5d88 (diff) | |
xhci: Fix NULL pointer dereference in xhci_clear_tt_buffer_complete()
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: ef513be0a905 ("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>
Diffstat (limited to 'drivers/usb/host')
| -rw-r--r-- | drivers/usb/host/xhci.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index 00f3804f7aa7..517ec3206f6e 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -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); |