From patchwork Tue Oct 25 22:26:57 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Grzeschik X-Patchwork-Id: 13019962 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 18F63C38A2D for ; Tue, 25 Oct 2022 22:27:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232789AbiJYW1b (ORCPT ); Tue, 25 Oct 2022 18:27:31 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37290 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232884AbiJYW1J (ORCPT ); Tue, 25 Oct 2022 18:27:09 -0400 Received: from metis.ext.pengutronix.de (metis.ext.pengutronix.de [IPv6:2001:67c:670:201:290:27ff:fe1d:cc33]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 713626E2C1 for ; Tue, 25 Oct 2022 15:27:01 -0700 (PDT) Received: from drehscheibe.grey.stw.pengutronix.de ([2a0a:edc0:0:c01:1d::a2]) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1onSNv-0005ne-Nz; Wed, 26 Oct 2022 00:26:59 +0200 Received: from [2a0a:edc0:0:1101:1d::ac] (helo=dude04.red.stw.pengutronix.de) by drehscheibe.grey.stw.pengutronix.de with esmtp (Exim 4.94.2) (envelope-from ) id 1onSNv-000OKo-Fo; Wed, 26 Oct 2022 00:26:58 +0200 Received: from mgr by dude04.red.stw.pengutronix.de with local (Exim 4.94.2) (envelope-from ) id 1onSNt-007u71-Vw; Wed, 26 Oct 2022 00:26:57 +0200 From: Michael Grzeschik To: linux-usb@vger.kernel.org Cc: linux-media@vger.kernel.org, gregkh@linuxfoundation.org, balbi@kernel.org, laurent.pinchart@ideasonboard.com, kernel@pengutronix.de Subject: [PATCH v5] usb: gadget: uvc: add validate and fix function for uvc response Date: Wed, 26 Oct 2022 00:26:57 +0200 Message-Id: <20221025222657.1883922-1-m.grzeschik@pengutronix.de> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 X-SA-Exim-Connect-IP: 2a0a:edc0:0:c01:1d::a2 X-SA-Exim-Mail-From: mgr@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-usb@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org When the userspace gets the setup requests for UVC_GET_CUR UVC_GET_MIN, UVC_GET_MAX, UVC_GET_DEF it will fill out the ctrl response. This data needs to be validated. Since the kernel also knows the limits for valid cases, it can fixup the values in case the userspace is setting invalid data. Signed-off-by: Michael Grzeschik --- v1: -> v4: - new patch v4: -> v5: - changed uvcg_info to uvcg_dbg for fixups, updated info strings drivers/usb/gadget/function/f_uvc.c | 4 +- drivers/usb/gadget/function/uvc.h | 1 + drivers/usb/gadget/function/uvc_v4l2.c | 76 ++++++++++++++++++++++++++ 3 files changed, 80 insertions(+), 1 deletion(-) diff --git a/drivers/usb/gadget/function/f_uvc.c b/drivers/usb/gadget/function/f_uvc.c index 6e131624011a5e..098bd3c4e3c0b3 100644 --- a/drivers/usb/gadget/function/f_uvc.c +++ b/drivers/usb/gadget/function/f_uvc.c @@ -254,8 +254,10 @@ uvc_function_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl) */ mctrl = &uvc_event->req; mctrl->wIndex &= ~cpu_to_le16(0xff); - if (interface == uvc->streaming_intf) + if (interface == uvc->streaming_intf) { + uvc->streaming_request = ctrl->bRequest; mctrl->wIndex = cpu_to_le16(UVC_STRING_STREAMING_IDX); + } v4l2_event_queue(&uvc->vdev, &v4l2_event); diff --git a/drivers/usb/gadget/function/uvc.h b/drivers/usb/gadget/function/uvc.h index 40226b1f7e148a..1be4d5f24b46bf 100644 --- a/drivers/usb/gadget/function/uvc.h +++ b/drivers/usb/gadget/function/uvc.h @@ -151,6 +151,7 @@ struct uvc_device { void *control_buf; unsigned int streaming_intf; + unsigned char streaming_request; /* Events */ unsigned int event_length; diff --git a/drivers/usb/gadget/function/uvc_v4l2.c b/drivers/usb/gadget/function/uvc_v4l2.c index c4ed48d6b8a407..d5bb3038626267 100644 --- a/drivers/usb/gadget/function/uvc_v4l2.c +++ b/drivers/usb/gadget/function/uvc_v4l2.c @@ -178,6 +178,67 @@ static struct uvcg_frame *find_closest_frame_by_size(struct uvc_device *uvc, * Requests handling */ +/* validate and fixup streaming ctrl request response data if possible */ +static void +uvc_validate_streaming_ctrl(struct uvc_device *uvc, + struct uvc_streaming_control *ctrl) +{ + struct f_uvc_opts *opts = fi_to_f_uvc_opts(uvc->func.fi); + unsigned int iformat, iframe; + struct uvcg_format *uformat; + struct uvcg_frame *uframe; + bool ival_found = false; + int i; + + iformat = ctrl->bFormatIndex; + iframe = ctrl->bFrameIndex; + + /* Restrict the iformat, iframe and dwFrameInterval to valid values. + * Negative values for iformat and iframe will result in the maximum + * valid value being selected + */ + iformat = clamp((unsigned int)iformat, 1U, + (unsigned int)uvc->header->num_fmt); + if (iformat != ctrl->bFormatIndex) { + uvcg_dbg(&uvc->func, + "userspace set invalid format index - fixup\n"); + ctrl->bFormatIndex = iformat; + } + uformat = find_format_by_index(uvc, iformat); + + iframe = clamp((unsigned int)iframe, 1U, + (unsigned int)uformat->num_frames); + if (iframe != ctrl->bFrameIndex) { + uvcg_dbg(&uvc->func, + "userspace set invalid frame index - fixup\n"); + ctrl->bFrameIndex = iframe; + } + uframe = find_frame_by_index(uvc, uformat, iframe); + + if (ctrl->dwFrameInterval) { + for (i = 0; i < uframe->frame.b_frame_interval_type; i++) { + if (ctrl->dwFrameInterval == + uframe->dw_frame_interval[i]) + ival_found = true; + } + } + if (!ival_found) { + uvcg_dbg(&uvc->func, + "userspace set invalid frame interval - fixup\n"); + ctrl->dwFrameInterval = uframe->frame.dw_default_frame_interval; + } + + if (!ctrl->dwMaxPayloadTransferSize || + ctrl->dwMaxPayloadTransferSize > + opts->streaming_maxpacket) + ctrl->dwMaxPayloadTransferSize = opts->streaming_maxpacket; + + if (!ctrl->dwMaxVideoFrameSize || + ctrl->dwMaxVideoFrameSize > + uframe->frame.dw_max_video_frame_buffer_size) + ctrl->dwMaxVideoFrameSize = uvc_get_frame_size(uformat, uframe); +} + static int uvc_send_response(struct uvc_device *uvc, struct uvc_request_data *data) { @@ -192,6 +253,21 @@ uvc_send_response(struct uvc_device *uvc, struct uvc_request_data *data) memcpy(req->buf, data->data, req->length); + /* validate the ctrl content and fixup */ + if (!uvc->event_setup_out) { + struct uvc_streaming_control *ctrl = req->buf; + + switch (uvc->streaming_request) { + case UVC_GET_CUR: + case UVC_GET_MIN: + case UVC_GET_MAX: + case UVC_GET_DEF: + uvc_validate_streaming_ctrl(uvc, ctrl); + default: + break; + } + } + return usb_ep_queue(cdev->gadget->ep0, req, GFP_KERNEL); }