From patchwork Wed Jun 23 08:45:21 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Johan Hovold X-Patchwork-Id: 12339297 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=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 79EBBC4743C for ; Wed, 23 Jun 2021 08:46:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 66EFD61361 for ; Wed, 23 Jun 2021 08:46:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230137AbhFWIsg (ORCPT ); Wed, 23 Jun 2021 04:48:36 -0400 Received: from mail.kernel.org ([198.145.29.99]:56374 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229934AbhFWIse (ORCPT ); Wed, 23 Jun 2021 04:48:34 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 301B561164; Wed, 23 Jun 2021 08:46:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1624437977; bh=mG6ErbLJ7lSo5V7i1rljNDUgVDQwNGUi4e3zpOu3v4E=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=s3Pyyo8QTH5g3DOMYBfcOVv1YW6m3r+/ul6h17e76XRM3i/yuG5G1/sqBHAKCNfZ2 Co4+AzYA/oD209zeeJhoHo0qJCzssCLeevSb2GV5sXYcoQbhcS6URt0TpKlvi+IGjA sHU1cmKP96oXndPZMdvXYQ6acfocMwgVOp8x5DGt8/l4w5oTwAGcakxsvy7zpGsdj8 GCsJ1ZdMcKOWUazjGlUbNn6YHok3MpgFHSbX2eBTML9b/ul7TtpEXqp3o/C6qFy1t6 Pxmd3v7Zh7W8MvuiuU7tb3Z91uvRoXkP8T/W2MFfFNI7eocPxSypMNhZGRwdOoQpNy hzEXYs7Kuiavw== Received: from johan by xi.lan with local (Exim 4.94.2) (envelope-from ) id 1lvyWV-0001s2-UM; Wed, 23 Jun 2021 10:46:15 +0200 From: Johan Hovold To: Mauro Carvalho Chehab , Hans Verkuil Cc: Antti Palosaari , Eero Lehtinen , linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, Johan Hovold , syzbot+faf11bbadc5a372564da@syzkaller.appspotmail.com, stable@vger.kernel.org Subject: [PATCH 2/2] media: rtl28xxu: fix zero-length control request Date: Wed, 23 Jun 2021 10:45:21 +0200 Message-Id: <20210623084521.7105-3-johan@kernel.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210623084521.7105-1-johan@kernel.org> References: <20210623084521.7105-1-johan@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org The direction of the pipe argument must match the request-type direction bit or control requests may fail depending on the host-controller-driver implementation. Control transfers without a data stage are treated as OUT requests by the USB stack and should be using usb_sndctrlpipe(). Failing to do so will now trigger a warning. The driver uses a zero-length i2c-read request for type detection so update the control-request code to use usb_sndctrlpipe() in this case. Note that actually trying to read the i2c register in question does not work as the register might not exist (e.g. depending on the demodulator) as reported by Eero Lehtinen . Reported-by: syzbot+faf11bbadc5a372564da@syzkaller.appspotmail.com Reported-by: Eero Lehtinen Tested-by: Eero Lehtinen Fixes: d0f232e823af ("[media] rtl28xxu: add heuristic to detect chip type") Cc: stable@vger.kernel.org # 4.0 Cc: Antti Palosaari Signed-off-by: Johan Hovold --- drivers/media/usb/dvb-usb-v2/rtl28xxu.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/drivers/media/usb/dvb-usb-v2/rtl28xxu.c b/drivers/media/usb/dvb-usb-v2/rtl28xxu.c index 0cbdb95f8d35..795a012d4020 100644 --- a/drivers/media/usb/dvb-usb-v2/rtl28xxu.c +++ b/drivers/media/usb/dvb-usb-v2/rtl28xxu.c @@ -37,7 +37,16 @@ static int rtl28xxu_ctrl_msg(struct dvb_usb_device *d, struct rtl28xxu_req *req) } else { /* read */ requesttype = (USB_TYPE_VENDOR | USB_DIR_IN); - pipe = usb_rcvctrlpipe(d->udev, 0); + + /* + * Zero-length transfers must use usb_sndctrlpipe() and + * rtl28xxu_identify_state() uses a zero-length i2c read + * command to determine the chip type. + */ + if (req->size) + pipe = usb_rcvctrlpipe(d->udev, 0); + else + pipe = usb_sndctrlpipe(d->udev, 0); } ret = usb_control_msg(d->udev, pipe, 0, requesttype, req->value,