From patchwork Mon May 24 11:09:18 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Johan Hovold X-Patchwork-Id: 447637 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, 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 42CCAC2B9F8 for ; Mon, 24 May 2021 11:09:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2A3CC611CE for ; Mon, 24 May 2021 11:09:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232792AbhEXLLT (ORCPT ); Mon, 24 May 2021 07:11:19 -0400 Received: from mail.kernel.org ([198.145.29.99]:36652 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232728AbhEXLLK (ORCPT ); Mon, 24 May 2021 07:11:10 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 8D6DE6120E; Mon, 24 May 2021 11:09:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1621854581; bh=i4o9pM1TO4UbXp2eyfjZ3b0JJ10hVOg6gx1op1DjUOE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=fNbZ+fIe83UGwa0r1jyRRXpxE/ZXt69KNUQHtGUvzOtNdxPqqoT6pBUz3Ev4ePOwc Gq6H789irbR9WaeiOpLAd9sHz3FczWjIEz9kAKPwXw39AHWxqNUI92rUCDDQiwn2Ey ic/JsMvWsZ09zwAOahHcinNfI4MbVrQgGt56fOJJH3O+4wEdbyAxxMLBg3xeLS8clF Ql7BgFDQaBQOiIusBRO7FlDHIBp/LmtNzeL+ZvI4LnPl1Vhsg2g7q+H4WKirIjQjTm L+c14I8QAbfDHhHKpY0HhLMPvTlQ2STeToyuVXqPosz/1pIOSh8wSpQm7csgkbasYm YUPfPOw1Dd6fA== Received: from johan by xi.lan with local (Exim 4.94.2) (envelope-from ) id 1ll8Sp-0006Pp-BJ; Mon, 24 May 2021 13:09:39 +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, Johan Hovold Subject: [PATCH 1/3] media: gspca/gl860: fix zero-length control requests Date: Mon, 24 May 2021 13:09:18 +0200 Message-Id: <20210524110920.24599-2-johan@kernel.org> X-Mailer: git-send-email 2.26.3 In-Reply-To: <20210524110920.24599-1-johan@kernel.org> References: <20210524110920.24599-1-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. Fix the gl860_RTx() helper so that zero-length control reads fail with an error message instead. Note that there are no current callers that would trigger this. Fixes: 4f7cb8837cec ("V4L/DVB (12954): gspca - gl860: Addition of GL860 based webcams") Signed-off-by: Johan Hovold --- drivers/media/usb/gspca/gl860/gl860.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/media/usb/gspca/gl860/gl860.c b/drivers/media/usb/gspca/gl860/gl860.c index 2c05ea2598e7..ce4ee8bc75c8 100644 --- a/drivers/media/usb/gspca/gl860/gl860.c +++ b/drivers/media/usb/gspca/gl860/gl860.c @@ -561,8 +561,8 @@ int gl860_RTx(struct gspca_dev *gspca_dev, len, 400 + 200 * (len > 1)); memcpy(pdata, gspca_dev->usb_buf, len); } else { - r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), - req, pref, val, index, NULL, len, 400); + gspca_err(gspca_dev, "zero-length read request\n"); + r = -EINVAL; } }