From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.kernel.org ([198.145.29.99]:51482 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728252AbeKJCPB (ORCPT ); Fri, 9 Nov 2018 21:15:01 -0500 Subject: patch "xhci: handle port status events for removed USB3 hcd" added to usb-linus To: mathias.nyman@linux.intel.com, gregkh@linuxfoundation.org, jackp@codeaurora.org, peter.chen@nxp.com, stable@vger.kernel.org From: Date: Fri, 09 Nov 2018 08:33:41 -0800 Message-ID: <154178122123597@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled xhci: handle port status events for removed USB3 hcd to my usb git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git in the usb-linus branch. The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.) The patch will hopefully also be merged in Linus's tree for the next -rc kernel release. If you have any questions about this process, please let me know. >>From 1245374e9b8340fc255fd51b2015173a83050d03 Mon Sep 17 00:00:00 2001 From: Mathias Nyman Date: Fri, 9 Nov 2018 17:21:18 +0200 Subject: xhci: handle port status events for removed USB3 hcd At xhci removal the USB3 hcd (shared_hcd) is removed before the primary USB2 hcd. Interrupts for port status changes may still occur for USB3 ports after the shared_hcd is freed, causing NULL pointer dereference. Check if xhci->shared_hcd is still valid before handing USB3 port events Cc: Reported-by: Peter Chen Tested-by: Jack Pham Signed-off-by: Mathias Nyman Signed-off-by: Greg Kroah-Hartman --- drivers/usb/host/xhci-ring.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c index a8d92c90fb58..80d464ea5a9a 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -1556,6 +1556,13 @@ static void handle_port_status(struct xhci_hcd *xhci, goto cleanup; } + /* We might get interrupts after shared_hcd is removed */ + if (port->rhub == &xhci->usb3_rhub && xhci->shared_hcd == NULL) { + xhci_dbg(xhci, "ignore port event for removed USB3 hcd\n"); + bogus_port_status = true; + goto cleanup; + } + hcd = port->rhub->hcd; bus_state = &xhci->bus_state[hcd_index(hcd)]; hcd_portnum = port->hcd_portnum; -- 2.19.1