From: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> This patch has been added to the 4.1 stable tree. If you have any objections, please let us know. =============== [ Upstream commit 53e5f36fbd2453ad69a3369a1db62dc06c30a4aa ] UBSAN complains about a left shift by -1 in proc_do_submiturb(). This can occur when an URB is submitted for a bulk or control endpoint on a high-speed device, since the code doesn't bother to check the endpoint type; normally only interrupt or isochronous endpoints have a nonzero bInterval value. Aside from the fact that the operation is illegal, it shouldn't matter because the result isn't used. Still, in theory it could cause a hardware exception or other problem, so we should work around it. This patch avoids doing the left shift unless the shift amount is >= 0. The same piece of code has another problem. When checking the device speed (the exponential encoding for interrupt endpoints is used only by high-speed or faster devices), we need to look for speed >= USB_SPEED_SUPER as well as speed == USB_SPEED HIGH. The patch adds this check. Signed-off-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> Reported-by: Vittorio Zecca <zeccav@xxxxxxxxx> Tested-by: Vittorio Zecca <zeccav@xxxxxxxxx> Suggested-by: Bjørn Mork <bjorn@xxxxxxx> CC: <stable@xxxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx> --- drivers/usb/core/devio.c | 16 +++++++++++----- 1 file changed, 11 insertions(+), 5 deletions(-) diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c index 986abde..3d46b0b 100644 --- a/drivers/usb/core/devio.c +++ b/drivers/usb/core/devio.c @@ -1526,11 +1526,17 @@ static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb as->urb->start_frame = uurb->start_frame; as->urb->number_of_packets = number_of_packets; as->urb->stream_id = stream_id; - if (uurb->type == USBDEVFS_URB_TYPE_ISO || - ps->dev->speed == USB_SPEED_HIGH) - as->urb->interval = 1 << min(15, ep->desc.bInterval - 1); - else - as->urb->interval = ep->desc.bInterval; + + if (ep->desc.bInterval) { + if (uurb->type == USBDEVFS_URB_TYPE_ISO || + ps->dev->speed == USB_SPEED_HIGH || + ps->dev->speed >= USB_SPEED_SUPER) + as->urb->interval = 1 << + min(15, ep->desc.bInterval - 1); + else + as->urb->interval = ep->desc.bInterval; + } + as->urb->context = as; as->urb->complete = async_completed; for (totlen = u = 0; u < number_of_packets; u++) { -- 2.7.4 ��.n��������+%������w��{.n�����������ܨ}���Ơz�j:+v�����w����ޙ��&�)ߡ�a����z�ޗ���ݢj��w�f