From patchwork Thu Jun 9 12:03:36 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mathias Nyman X-Patchwork-Id: 12875440 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3EB6AC43334 for ; Thu, 9 Jun 2022 12:02:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237581AbiFIMCw (ORCPT ); Thu, 9 Jun 2022 08:02:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:32956 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236504AbiFIMCu (ORCPT ); Thu, 9 Jun 2022 08:02:50 -0400 Received: from mga03.intel.com (mga03.intel.com [134.134.136.65]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4579D6D39A for ; Thu, 9 Jun 2022 05:02:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1654776168; x=1686312168; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=cTic0mTIKuxHFwLGK2iox4ar6809DO3DQ2zz48eDte4=; b=JqffStp3bbvh07YYfl/xX3VpUr7kRkfuyLDuSWgazOWVmXbo272cxTUR xZwF584z95SIKLLlrCcFb8t6Ae6T6oGVgk2TGwIQ9yNQ90BbPCIjckUbL 0D8nGF4IklxrhzazDnNGWct16XbduMQA/DNM9nUgomGY2dVdhecrjFiJM +Q1MHB3nJ7R8KfRxuyJdoT2SSZJJN0kTmzTgDn6bq8NiN2RC7aJABmWH4 5FDoSilX+35San1upQsigCW8ljNJC6t+o+MOzH7gyxU3VuoBpXbg8FBf1 P7DSszjlvUpFuokRL5YuSJx8yC1xvDljTqSVK/Ouu1hU5OXZ4njOXacMy g==; X-IronPort-AV: E=McAfee;i="6400,9594,10372"; a="278406683" X-IronPort-AV: E=Sophos;i="5.91,287,1647327600"; d="scan'208";a="278406683" Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Jun 2022 05:02:40 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.91,287,1647327600"; d="scan'208";a="637484776" Received: from mattu-haswell.fi.intel.com ([10.237.72.199]) by fmsmga008.fm.intel.com with ESMTP; 09 Jun 2022 05:02:36 -0700 From: Mathias Nyman To: mka@chromium.org, hkallweit1@gmail.com Cc: , , Mathias Nyman , , quic_jackp@quicinc.com, tunguyen@apm.com, linux-amlogic@lists.infradead.org Subject: [RFT PATCH] xhci: Fix null pointer dereference in resume if xhci has only one roothub Date: Thu, 9 Jun 2022 15:03:36 +0300 Message-Id: <20220609120336.831533-1-mathias.nyman@linux.intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org In the re-init path xhci_resume() passes 'hcd->primary_hcd' to hci_init(), however this field isn't initialized by __usb_create_hcd() for a HCD without secondary controller. xhci_resume() is called once per xHC device, not per hcd, so the extra checking for primary hcd can be removed. Fixes: e0fe986972f5 ("usb: host: xhci-plat: prepare operation w/o shared hcd") Reported-by: Matthias Kaehlcke Signed-off-by: Mathias Nyman Tested-by: Matthias Kaehlcke --- drivers/usb/host/xhci.c | 15 +++++---------- 1 file changed, 5 insertions(+), 10 deletions(-) diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index f0ab63138016..9ac56e9ffc64 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -1107,7 +1107,6 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated) { u32 command, temp = 0; struct usb_hcd *hcd = xhci_to_hcd(xhci); - struct usb_hcd *secondary_hcd; int retval = 0; bool comp_timer_running = false; bool pending_portevent = false; @@ -1214,23 +1213,19 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated) * first with the primary HCD, and then with the secondary HCD. * If we don't do the same, the host will never be started. */ - if (!usb_hcd_is_primary_hcd(hcd)) - secondary_hcd = hcd; - else - secondary_hcd = xhci->shared_hcd; - xhci_dbg(xhci, "Initialize the xhci_hcd\n"); - retval = xhci_init(hcd->primary_hcd); + retval = xhci_init(hcd); if (retval) return retval; comp_timer_running = true; xhci_dbg(xhci, "Start the primary HCD\n"); - retval = xhci_run(hcd->primary_hcd); - if (!retval && secondary_hcd) { + retval = xhci_run(hcd); + if (!retval && xhci->shared_hcd) { xhci_dbg(xhci, "Start the secondary HCD\n"); - retval = xhci_run(secondary_hcd); + retval = xhci_run(xhci->shared_hcd); } + hcd->state = HC_STATE_SUSPENDED; if (xhci->shared_hcd) xhci->shared_hcd->state = HC_STATE_SUSPENDED;