From patchwork Sat May 2 00:44:44 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thinh Nguyen X-Patchwork-Id: 11523551 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 4042792C for ; Sat, 2 May 2020 00:44:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1FFD821582 for ; Sat, 2 May 2020 00:44:48 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=synopsys.com header.i=@synopsys.com header.b="aPLoFZEW" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726455AbgEBAor (ORCPT ); Fri, 1 May 2020 20:44:47 -0400 Received: from smtprelay-out1.synopsys.com ([149.117.73.133]:34772 "EHLO smtprelay-out1.synopsys.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726352AbgEBAoq (ORCPT ); Fri, 1 May 2020 20:44:46 -0400 Received: from mailhost.synopsys.com (sv2-mailhost1.synopsys.com [10.205.2.133]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (No client certificate requested) by smtprelay-out1.synopsys.com (Postfix) with ESMTPS id 50B1E4398D; Sat, 2 May 2020 00:44:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=synopsys.com; s=mail; t=1588380286; bh=f2s7mSgHF8VO4XLOfnwmQTgt2ilzKuI2hZe+IzdJUJM=; h=Date:From:Subject:To:Cc:From; b=aPLoFZEWBpENlDqHDxmnRjK4Fwo1irAi4Z+hBEXc/a3/tQNRIzJ6/hPCH+4dFfmUC iplDwVPIHuB0JgKq5s+bUGHMdVbFcugF44doj0gU3LKm2q7tdq4WruJYH9HNdbPnPQ We0n3SWhfaGm4zphdVwAgrMWhgPWQUho85ruG8KRzZ1dBTIMym2PZpy8whL/gMXF4I znWfQna8kqDlf85dUtalBLLaMq16gdBg1oTh8Ue69pziprgksWqPI0fTQEwfVTyuL6 LJVxzptoDvOXgbk1db4+0XFUKM+1gNArrO7M6bmmDgB5eRoH5yLzOADXccDtQaCni+ Dk5jQTpMDmYoA== Received: from te-lab16 (nanobot.internal.synopsys.com [10.10.186.99]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mailhost.synopsys.com (Postfix) with ESMTPSA id D5542A0259; Sat, 2 May 2020 00:44:44 +0000 (UTC) Received: by te-lab16 (sSMTP sendmail emulation); Fri, 01 May 2020 17:44:44 -0700 Date: Fri, 01 May 2020 17:44:44 -0700 Message-Id: <7685ba14eaa185a170d6c4c9668d2ad98eeb8b14.1588380090.git.thinhn@synopsys.com> From: Thinh Nguyen Subject: [PATCH] usb: dwc3: gadget: Don't setup more than requested To: Felipe Balbi , Greg Kroah-Hartman , linux-usb@vger.kernel.org, Anurag Kumar Vulisha Cc: John Youn , Thinh Nguyen , stable@vger.kernel.org Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org The sgl may be allocated larger than the requested length. Check the usb_request->length and make sure that we don't setup the TRB to send/receive more than requested. Cc: stable@vger.kernel.org Fixes: a31e63b608ff ("usb: dwc3: gadget: Correct handling of scattergather lists") Signed-off-by: Thinh Nguyen --- drivers/usb/dwc3/gadget.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index 4ca3e197bee4..95ec39e42409 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -1040,7 +1040,8 @@ static void dwc3_prepare_one_trb(struct dwc3_ep *dep, unsigned no_interrupt = req->request.no_interrupt; if (req->request.num_sgs > 0) { - length = sg_dma_len(req->start_sg); + length = min_t(unsigned int, req->request.length, + sg_dma_len(req->start_sg)); dma = sg_dma_address(req->start_sg); } else { length = req->request.length;