From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0FDC3C28CA6 for ; Thu, 16 Sep 2021 17:41:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E512460EE9 for ; Thu, 16 Sep 2021 17:41:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1347176AbhIPRmc (ORCPT ); Thu, 16 Sep 2021 13:42:32 -0400 Received: from mail.kernel.org ([198.145.29.99]:53754 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344614AbhIPRf5 (ORCPT ); Thu, 16 Sep 2021 13:35:57 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 3C5D26152B; Thu, 16 Sep 2021 16:49:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1631810948; bh=EFk7taVLDDEyryR2UN+6vNU2VWI9oVuX3ynm0n8vEZM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=VAE/FHmDNea4ikGTlT96mbpYSlCypgu8ChjaQRKpkytcZ3WPW4T0MFZYb7l8/UIyE V2nq5BM49kA/5KEWCjj2MQi2XkDfDwNqdhKJ2A1SuKOhQYuRiCvtOTCM7chSWrd/ey vjNXueskL76PAeGsTKRj4/N5meHJswVE+Xu9Wq1U= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Zhipeng Wang , Li Jun , Peter Chen , Sasha Levin Subject: [PATCH 5.14 327/432] usb: chipidea: host: fix port index underflow and UBSAN complains Date: Thu, 16 Sep 2021 18:01:16 +0200 Message-Id: <20210916155821.928749993@linuxfoundation.org> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210916155810.813340753@linuxfoundation.org> References: <20210916155810.813340753@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Li Jun [ Upstream commit e5d6a7c6cfae9e714a0e8ff64facd1ac68a784c6 ] If wIndex is 0 (and it often is), these calculations underflow and UBSAN complains, here resolve this by not decrementing the index when it is equal to 0, this copies the solution from commit 85e3990bea49 ("USB: EHCI: avoid undefined pointer arithmetic and placate UBSAN") Reported-by: Zhipeng Wang Signed-off-by: Li Jun Link: https://lore.kernel.org/r/1624004938-2399-1-git-send-email-jun.li@nxp.com Signed-off-by: Peter Chen Signed-off-by: Sasha Levin --- drivers/usb/chipidea/host.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-) diff --git a/drivers/usb/chipidea/host.c b/drivers/usb/chipidea/host.c index e86d13c04bdb..bdc3885c0d49 100644 --- a/drivers/usb/chipidea/host.c +++ b/drivers/usb/chipidea/host.c @@ -240,15 +240,18 @@ static int ci_ehci_hub_control( ) { struct ehci_hcd *ehci = hcd_to_ehci(hcd); + unsigned int ports = HCS_N_PORTS(ehci->hcs_params); u32 __iomem *status_reg; - u32 temp; + u32 temp, port_index; unsigned long flags; int retval = 0; bool done = false; struct device *dev = hcd->self.controller; struct ci_hdrc *ci = dev_get_drvdata(dev); - status_reg = &ehci->regs->port_status[(wIndex & 0xff) - 1]; + port_index = wIndex & 0xff; + port_index -= (port_index > 0); + status_reg = &ehci->regs->port_status[port_index]; spin_lock_irqsave(&ehci->lock, flags); @@ -260,6 +263,11 @@ static int ci_ehci_hub_control( } if (typeReq == SetPortFeature && wValue == USB_PORT_FEAT_SUSPEND) { + if (!wIndex || wIndex > ports) { + retval = -EPIPE; + goto done; + } + temp = ehci_readl(ehci, status_reg); if ((temp & PORT_PE) == 0 || (temp & PORT_RESET) != 0) { retval = -EPIPE; @@ -288,7 +296,7 @@ static int ci_ehci_hub_control( ehci_writel(ehci, temp, status_reg); } - set_bit((wIndex & 0xff) - 1, &ehci->suspended_ports); + set_bit(port_index, &ehci->suspended_ports); goto done; } -- 2.30.2