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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D8DD4C46467 for ; Mon, 16 Jan 2023 16:56:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234066AbjAPQ4w (ORCPT ); Mon, 16 Jan 2023 11:56:52 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50894 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234027AbjAPQ4X (ORCPT ); Mon, 16 Jan 2023 11:56:23 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 930172BF3E for ; Mon, 16 Jan 2023 08:39:24 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id DEA74B80DC7 for ; Mon, 16 Jan 2023 16:39:22 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 40FFCC433D2; Mon, 16 Jan 2023 16:39:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1673887161; bh=uwXlHNydaRJ5JVP9Dbm9KJNwZfhexg/RxWywso4OV1Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZxYM485L1MbluPj3+e10Bivfl8N9eIWqxssVMv18vyncH7DtEo8J+FlfybfwEMUYf lVcfl0JHwm26GDZKpTrXWpBjBPNbxNv2Vaa3W1LEgM12Ei4e7KFnulfG9PxWxBp8/a qG+BBblc0/g248NdofFc34em0vHrh2DJ+t3E5sgA= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, stable , Laurent Pinchart , Daniel Scally , Szymon Heidrich Subject: [PATCH 4.19 015/521] usb: gadget: uvc: Prevent buffer overflow in setup handler Date: Mon, 16 Jan 2023 16:44:37 +0100 Message-Id: <20230116154847.949678933@linuxfoundation.org> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20230116154847.246743274@linuxfoundation.org> References: <20230116154847.246743274@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Szymon Heidrich commit 4c92670b16727365699fe4b19ed32013bab2c107 upstream. Setup function uvc_function_setup permits control transfer requests with up to 64 bytes of payload (UVC_MAX_REQUEST_SIZE), data stage handler for OUT transfer uses memcpy to copy req->actual bytes to uvc_event->data.data array of size 60. This may result in an overflow of 4 bytes. Fixes: cdda479f15cd ("USB gadget: video class function driver") Cc: stable Reviewed-by: Laurent Pinchart Reviewed-by: Daniel Scally Signed-off-by: Szymon Heidrich Link: https://lore.kernel.org/r/20221206141301.51305-1-szymon.heidrich@gmail.com Signed-off-by: Greg Kroah-Hartman --- drivers/usb/gadget/function/f_uvc.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) --- a/drivers/usb/gadget/function/f_uvc.c +++ b/drivers/usb/gadget/function/f_uvc.c @@ -219,8 +219,9 @@ uvc_function_ep0_complete(struct usb_ep memset(&v4l2_event, 0, sizeof(v4l2_event)); v4l2_event.type = UVC_EVENT_DATA; - uvc_event->data.length = req->actual; - memcpy(&uvc_event->data.data, req->buf, req->actual); + uvc_event->data.length = min_t(unsigned int, req->actual, + sizeof(uvc_event->data.data)); + memcpy(&uvc_event->data.data, req->buf, uvc_event->data.length); v4l2_event_queue(&uvc->vdev, &v4l2_event); } }