From patchwork Mon May 31 09:44:33 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Johan Hovold X-Patchwork-Id: 12289073 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 DCBB7C47099 for ; Mon, 31 May 2021 09:45:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B27006127C for ; Mon, 31 May 2021 09:45:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231286AbhEaJre (ORCPT ); Mon, 31 May 2021 05:47:34 -0400 Received: from mail.kernel.org ([198.145.29.99]:56114 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231180AbhEaJra (ORCPT ); Mon, 31 May 2021 05:47:30 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 143EB6023C; Mon, 31 May 2021 09:45:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1622454351; bh=MfFj2A1+plW7C8UGXf3GwEVFhMD2e02UkVEb+mKDLeQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Mj+Q7Gg6C6ei6AznJpPJGiG3L5mspDxkEnNr1JBJX0NL8x6/k6MAuMAiBcrLkeaNV gcuh7ctErMOV/CNXUE8j0pPf3jqj7cmXS4QOIbGalo6AOfsQY8KDKSHrFQBAcyGQCC AqXuDwo9CZwZTIRWXTTsn/0MKgkMTpAT9oghOeYPLX2I8/2vPdNbhzrYe3MkecBE09 LzpmeXazgYsZcvPnggTCZDj/jwk/yXP+X3AuocBSy4W+RlhvooQSzcbVA7SvVqJ0lp /Yi9eDcGxs+tXdpM4cJKeC4F5QDLkoL45tNB6U8F722+4Me98xURfpfn6vX4eufi9K RzZHGR120903A== Received: from johan by xi.lan with local (Exim 4.94.2) (envelope-from ) id 1lneUU-0003JN-B9; Mon, 31 May 2021 11:45:46 +0200 From: Johan Hovold To: Mauro Carvalho Chehab Cc: Hans Verkuil , linux-media@vger.kernel.org, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Eero Lehtinen , Johan Hovold , stable@vger.kernel.org Subject: [PATCH v2 2/3] media: gspca/sunplus: fix zero-length control requests Date: Mon, 31 May 2021 11:44:33 +0200 Message-Id: <20210531094434.12651-3-johan@kernel.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210531094434.12651-1-johan@kernel.org> References: <20210531094434.12651-1-johan@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-usb@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. Fix the single zero-length control request which was using the read-register helper, and update the helper so that zero-length reads fail with an error message instead. Fixes: 6a7eba24e4f0 ("V4L/DVB (8157): gspca: all subdrivers") Cc: stable@vger.kernel.org # 2.6.27 Signed-off-by: Johan Hovold --- drivers/media/usb/gspca/sunplus.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/media/usb/gspca/sunplus.c b/drivers/media/usb/gspca/sunplus.c index ace3da40006e..971dee0a56da 100644 --- a/drivers/media/usb/gspca/sunplus.c +++ b/drivers/media/usb/gspca/sunplus.c @@ -242,6 +242,10 @@ static void reg_r(struct gspca_dev *gspca_dev, gspca_err(gspca_dev, "reg_r: buffer overflow\n"); return; } + if (len == 0) { + gspca_err(gspca_dev, "reg_r: zero-length read\n"); + return; + } if (gspca_dev->usb_err < 0) return; ret = usb_control_msg(gspca_dev->dev, @@ -250,7 +254,7 @@ static void reg_r(struct gspca_dev *gspca_dev, USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE, 0, /* value */ index, - len ? gspca_dev->usb_buf : NULL, len, + gspca_dev->usb_buf, len, 500); if (ret < 0) { pr_err("reg_r err %d\n", ret); @@ -727,7 +731,7 @@ static int sd_start(struct gspca_dev *gspca_dev) case MegaImageVI: reg_w_riv(gspca_dev, 0xf0, 0, 0); spca504B_WaitCmdStatus(gspca_dev); - reg_r(gspca_dev, 0xf0, 4, 0); + reg_w_riv(gspca_dev, 0xf0, 4, 0); spca504B_WaitCmdStatus(gspca_dev); break; default: