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=-0.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,T_DKIMWL_WL_HIGH, URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by aws-us-west-2-korg-lkml-1.web.codeaurora.org (Postfix) with ESMTP id C039DC07D5C for ; Thu, 14 Jun 2018 14:48:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6B4D5208CB for ; Thu, 14 Jun 2018 14:48:42 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="gDHwXovy" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6B4D5208CB Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linuxfoundation.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965169AbeFNOsk (ORCPT ); Thu, 14 Jun 2018 10:48:40 -0400 Received: from mail.kernel.org ([198.145.29.99]:48030 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965081AbeFNOHm (ORCPT ); Thu, 14 Jun 2018 10:07:42 -0400 Received: from localhost (LFbn-1-12247-202.w90-92.abo.wanadoo.fr [90.92.61.202]) (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 350E1208DA; Thu, 14 Jun 2018 14:07:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1528985261; bh=TpWZsyeMYc3ntb3vzAJViuO1EHm7ni5uPY/bcNrkVuM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=gDHwXovyoioXfHOuBVLLla4oJ4zH8KKH1/Z50MWIq009yDPuTAcaqcuVZc6M77Ktb urjxjSWy6aJwoNnH0SkuzRxiJMkCISzoTie/RNeqzBpJoYgmk4pZGVTUEjfnDVbJvm KOg0nXUBtJaNXBY9M6qTy1413Eq5/QtXME6zNCWA= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Carlos Manuel Santos , Samuel Ortiz , Stephen Hemminger , Johan Hovold Subject: [PATCH 4.16 10/43] NFC: pn533: dont send USB data off of the stack Date: Thu, 14 Jun 2018 16:04:14 +0200 Message-Id: <20180614132135.548596304@linuxfoundation.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20180614132135.111973468@linuxfoundation.org> References: <20180614132135.111973468@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.16-stable review patch. If anyone has any objections, please let me know. ------------------ From: Greg Kroah-Hartman commit dbafc28955fa6779dc23d1607a0fee5e509a278b upstream. It's amazing that this driver ever worked, but now that x86 doesn't allow USB data to be sent off of the stack, it really does not work at all. Fix this up by properly allocating the data for the small "commands" that get sent to the device off of the stack. We do this for one command by having a whole urb just for ack messages, as they can be submitted in interrupt context, so we can not use usb_bulk_msg(). But the poweron command can sleep (and does), so use usb_bulk_msg() for that transfer. Reported-by: Carlos Manuel Santos Cc: Samuel Ortiz Cc: Stephen Hemminger Cc: stable Reviewed-by: Johan Hovold Signed-off-by: Greg Kroah-Hartman --- drivers/nfc/pn533/usb.c | 42 ++++++++++++++++++++++++++++++------------ 1 file changed, 30 insertions(+), 12 deletions(-) --- a/drivers/nfc/pn533/usb.c +++ b/drivers/nfc/pn533/usb.c @@ -62,6 +62,9 @@ struct pn533_usb_phy { struct urb *out_urb; struct urb *in_urb; + struct urb *ack_urb; + u8 *ack_buffer; + struct pn533 *priv; }; @@ -150,13 +153,16 @@ static int pn533_usb_send_ack(struct pn5 struct pn533_usb_phy *phy = dev->phy; static const u8 ack[6] = {0x00, 0x00, 0xff, 0x00, 0xff, 0x00}; /* spec 7.1.1.3: Preamble, SoPC (2), ACK Code (2), Postamble */ - int rc; - phy->out_urb->transfer_buffer = (u8 *)ack; - phy->out_urb->transfer_buffer_length = sizeof(ack); - rc = usb_submit_urb(phy->out_urb, flags); + if (!phy->ack_buffer) { + phy->ack_buffer = kmemdup(ack, sizeof(ack), flags); + if (!phy->ack_buffer) + return -ENOMEM; + } - return rc; + phy->ack_urb->transfer_buffer = phy->ack_buffer; + phy->ack_urb->transfer_buffer_length = sizeof(ack); + return usb_submit_urb(phy->ack_urb, flags); } static int pn533_usb_send_frame(struct pn533 *dev, @@ -375,26 +381,31 @@ static int pn533_acr122_poweron_rdr(stru /* Power on th reader (CCID cmd) */ u8 cmd[10] = {PN533_ACR122_PC_TO_RDR_ICCPOWERON, 0, 0, 0, 0, 0, 0, 3, 0, 0}; + char *buffer; + int transferred; int rc; void *cntx; struct pn533_acr122_poweron_rdr_arg arg; dev_dbg(&phy->udev->dev, "%s\n", __func__); + buffer = kmemdup(cmd, sizeof(cmd), GFP_KERNEL); + if (!buffer) + return -ENOMEM; + init_completion(&arg.done); cntx = phy->in_urb->context; /* backup context */ phy->in_urb->complete = pn533_acr122_poweron_rdr_resp; phy->in_urb->context = &arg; - phy->out_urb->transfer_buffer = cmd; - phy->out_urb->transfer_buffer_length = sizeof(cmd); - print_hex_dump_debug("ACR122 TX: ", DUMP_PREFIX_NONE, 16, 1, cmd, sizeof(cmd), false); - rc = usb_submit_urb(phy->out_urb, GFP_KERNEL); - if (rc) { + rc = usb_bulk_msg(phy->udev, phy->out_urb->pipe, buffer, sizeof(cmd), + &transferred, 0); + kfree(buffer); + if (rc || (transferred != sizeof(cmd))) { nfc_err(&phy->udev->dev, "Reader power on cmd error %d\n", rc); return rc; @@ -490,8 +501,9 @@ static int pn533_usb_probe(struct usb_in phy->in_urb = usb_alloc_urb(0, GFP_KERNEL); phy->out_urb = usb_alloc_urb(0, GFP_KERNEL); + phy->ack_urb = usb_alloc_urb(0, GFP_KERNEL); - if (!phy->in_urb || !phy->out_urb) + if (!phy->in_urb || !phy->out_urb || !phy->ack_urb) goto error; usb_fill_bulk_urb(phy->in_urb, phy->udev, @@ -501,7 +513,9 @@ static int pn533_usb_probe(struct usb_in usb_fill_bulk_urb(phy->out_urb, phy->udev, usb_sndbulkpipe(phy->udev, out_endpoint), NULL, 0, pn533_send_complete, phy); - + usb_fill_bulk_urb(phy->ack_urb, phy->udev, + usb_sndbulkpipe(phy->udev, out_endpoint), + NULL, 0, pn533_send_complete, phy); switch (id->driver_info) { case PN533_DEVICE_STD: @@ -554,6 +568,7 @@ static int pn533_usb_probe(struct usb_in error: usb_free_urb(phy->in_urb); usb_free_urb(phy->out_urb); + usb_free_urb(phy->ack_urb); usb_put_dev(phy->udev); kfree(in_buf); @@ -573,10 +588,13 @@ static void pn533_usb_disconnect(struct usb_kill_urb(phy->in_urb); usb_kill_urb(phy->out_urb); + usb_kill_urb(phy->ack_urb); kfree(phy->in_urb->transfer_buffer); usb_free_urb(phy->in_urb); usb_free_urb(phy->out_urb); + usb_free_urb(phy->ack_urb); + kfree(phy->ack_buffer); nfc_info(&interface->dev, "NXP PN533 NFC device disconnected\n"); }