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=-9.0 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,T_DKIMWL_WL_HIGH,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 A4061C43219 for ; Thu, 2 May 2019 15:22:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6EBC0214DA for ; Thu, 2 May 2019 15:22:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1556810544; bh=kWQ+BR2bt9YKyfOZkuevkxa5xHHEhv4G6qbod7AJGIE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=KYStv0ejMSsTv8DsEGvIjj9mAaNucPpEURTuHiyc4O28SsyXf3ygeyYeBv3KtQehk IjsSBO6AAQ/PLmU0lQSpzNMvKuUD6tWydOvYezGu3/qN/XK7E0W1PYQwmCC6vZdrEo AQsgj40o0w08vnFkR63izQqxxJvcHWt5mA03GEX4= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726603AbfEBPWX (ORCPT ); Thu, 2 May 2019 11:22:23 -0400 Received: from mail.kernel.org ([198.145.29.99]:37632 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726573AbfEBPWV (ORCPT ); Thu, 2 May 2019 11:22:21 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 1359F20B7C; Thu, 2 May 2019 15:22:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1556810540; bh=kWQ+BR2bt9YKyfOZkuevkxa5xHHEhv4G6qbod7AJGIE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=e1s78eDkORFOoyvnxvYE9fT4Fpi8+j9U08DcFS/JBDL932bxHbaGG30a4S/iZwbpa rHU3IAdGvdNtilwJbiv8KodcQOZkWy3eoCLFbTfp71rLeIUUq7Tht1wU4XAqKDZ9Jm fjLPyd9pxAkV35BlHcgtM0BOKA3s1nZJY5BXKpRE= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Alan Stern , Guido Kiener , Felipe Balbi , "Sasha Levin (Microsoft)" Subject: [PATCH 4.9 11/32] usb: gadget: net2280: Fix overrun of OUT messages Date: Thu, 2 May 2019 17:20:57 +0200 Message-Id: <20190502143318.704653010@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190502143314.649935114@linuxfoundation.org> References: <20190502143314.649935114@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org [ Upstream commit 9d6a54c1430647355a5e23434881b2ca3d192b48 ] The OUT endpoint normally blocks (NAK) subsequent packets when a short packet was received and returns an incomplete queue entry to the gadget driver. Thereby the gadget driver can detect a short packet when reading queue entries with a length that is not equal to a multiple of packet size. The start_queue() function enables receiving OUT packets regardless of the content of the OUT FIFO. This results in a race: With the current code, it's possible that the "!ep->is_in && (readl(&ep->regs->ep_stat) & BIT(NAK_OUT_PACKETS))" test in start_dma() will fail, then a short packet will be received, and then start_queue() will call stop_out_naking(). That's what we don't want (OUT naking gets turned off while there is data in the FIFO) because then the next driver request might receive a mixture of old and new packets. With the patch, this race can't occur because the FIFO's state is tested after we know that OUT naking is already turned on, and OUT naking is stopped only when both of the conditions are met. This ensures that all received data is delivered to the gadget driver, which can detect a short packet now before new packets are appended to the last short packet. Acked-by: Alan Stern Signed-off-by: Guido Kiener Signed-off-by: Felipe Balbi Signed-off-by: Sasha Levin (Microsoft) --- drivers/usb/gadget/udc/net2280.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/drivers/usb/gadget/udc/net2280.c b/drivers/usb/gadget/udc/net2280.c index 7a8c36642293..57b88f4f49c5 100644 --- a/drivers/usb/gadget/udc/net2280.c +++ b/drivers/usb/gadget/udc/net2280.c @@ -870,9 +870,6 @@ static void start_queue(struct net2280_ep *ep, u32 dmactl, u32 td_dma) (void) readl(&ep->dev->pci->pcimstctl); writel(BIT(DMA_START), &dma->dmastat); - - if (!ep->is_in) - stop_out_naking(ep); } static void start_dma(struct net2280_ep *ep, struct net2280_request *req) @@ -911,6 +908,7 @@ static void start_dma(struct net2280_ep *ep, struct net2280_request *req) writel(BIT(DMA_START), &dma->dmastat); return; } + stop_out_naking(ep); } tmp = dmactl_default; -- 2.19.1