From patchwork Thu May 20 09:19:16 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 445723 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=ham 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 B6098C433B4 for ; Thu, 20 May 2021 09:56:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 95D9061C93 for ; Thu, 20 May 2021 09:56:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233593AbhETJ5e (ORCPT ); Thu, 20 May 2021 05:57:34 -0400 Received: from mail.kernel.org ([198.145.29.99]:58884 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234999AbhETJz3 (ORCPT ); Thu, 20 May 2021 05:55:29 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id A020361407; Thu, 20 May 2021 09:37:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1621503436; bh=DNbB14rNDgp36EwfV0cee1kPB1JosHYihntvhZHWNME=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=I7w2c/tU92BT/HNahDzusf8VB/Az4YDPnAdsCxrBXB2mXmuUZBGln2n1kr5JsE++y UtRd37+b4Vu9GIv4YXqPQ0hAjoGw0w4fZxNLTg/7JwiJXM50tJwxaEFaFEyUdQWRq4 2Q8ELfpwbkFdW5RDBecVYpD1wZPYVuPRXkcU0gKg= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Fabian Vogt , Sasha Levin Subject: [PATCH 4.19 187/425] fotg210-udc: Dont DMA more than the buffer can take Date: Thu, 20 May 2021 11:19:16 +0200 Message-Id: <20210520092137.566807812@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210520092131.308959589@linuxfoundation.org> References: <20210520092131.308959589@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Fabian Vogt [ Upstream commit 3e7c2510bdfe89a9ec223dd7acd6bfc8bb1cbeb6 ] Before this, it wrote as much as available into the buffer, even if it didn't fit. Fixes: b84a8dee23fd ("usb: gadget: add Faraday fotg210_udc driver") Signed-off-by: Fabian Vogt Link: https://lore.kernel.org/r/20210324141115.9384-7-fabian@ritter-vogt.de Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/usb/gadget/udc/fotg210-udc.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/usb/gadget/udc/fotg210-udc.c b/drivers/usb/gadget/udc/fotg210-udc.c index 41cc5babd50d..7ae0243c32e5 100644 --- a/drivers/usb/gadget/udc/fotg210-udc.c +++ b/drivers/usb/gadget/udc/fotg210-udc.c @@ -337,8 +337,9 @@ static void fotg210_start_dma(struct fotg210_ep *ep, } else { buffer = req->req.buf + req->req.actual; length = ioread32(ep->fotg210->reg + - FOTG210_FIBCR(ep->epnum - 1)); - length &= FIBCR_BCFX; + FOTG210_FIBCR(ep->epnum - 1)) & FIBCR_BCFX; + if (length > req->req.length - req->req.actual) + length = req->req.length - req->req.actual; } } else { buffer = req->req.buf + req->req.actual;