From patchwork Mon Oct 5 15:26:19 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 290680 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=-10.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 9BA1FC4363A for ; Mon, 5 Oct 2020 15:26:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5221220774 for ; Mon, 5 Oct 2020 15:26:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1601911612; bh=xBiTZET1LZJ5RMPwOKvlVkJen6iPOk4eHfa4i09/E4A=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=VNLMvdzOSOfcuTm1Ub9+RyRiuRb8vz43LT4oiV0+7JS9Xzri5KCZ6mzU2MEHmfzB7 Glg6v0mCeEE8hWUv63i+Q04rbTt8rrW6v7nltVL6aLg/1hMSZgaKVwhmcuvxcKYBIY R0LLVAaBG5B4RwzM7gtqgPHR7Ksrc0tQ9518CymE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727080AbgJEP0v (ORCPT ); Mon, 5 Oct 2020 11:26:51 -0400 Received: from mail.kernel.org ([198.145.29.99]:51238 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725960AbgJEP0v (ORCPT ); Mon, 5 Oct 2020 11:26:51 -0400 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id F3B1F20774; Mon, 5 Oct 2020 15:26:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1601911610; bh=xBiTZET1LZJ5RMPwOKvlVkJen6iPOk4eHfa4i09/E4A=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PE/OcGM4vUBEvniMycO7Z/jRmFV4ro3aWH/knsFYxNYwXcO+yG934Q3dE6vUuvn6K 7Ypm4k8d71KB86box7V1j7bAlw51SlHos3dmfe7GTeesjwy6U179yeS14iHMmoTm3E 7tGs5yTD51TsZX5mSlzzq3T+pgqrDL+Z4gKmjdGI= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Ilja Van Sprundel , Brooke Basile , stable , Bryan ODonoghue Subject: [PATCH 4.19 02/38] USB: gadget: f_ncm: Fix NDP16 datagram validation Date: Mon, 5 Oct 2020 17:26:19 +0200 Message-Id: <20201005142108.771915994@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201005142108.650363140@linuxfoundation.org> References: <20201005142108.650363140@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Bryan O'Donoghue commit 2b405533c2560d7878199c57d95a39151351df72 upstream. commit 2b74b0a04d3e ("USB: gadget: f_ncm: add bounds checks to ncm_unwrap_ntb()") adds important bounds checking however it unfortunately also introduces a bug with respect to section 3.3.1 of the NCM specification. wDatagramIndex[1] : "Byte index, in little endian, of the second datagram described by this NDP16. If zero, then this marks the end of the sequence of datagrams in this NDP16." wDatagramLength[1]: "Byte length, in little endian, of the second datagram described by this NDP16. If zero, then this marks the end of the sequence of datagrams in this NDP16." wDatagramIndex[1] and wDatagramLength[1] respectively then may be zero but that does not mean we should throw away the data referenced by wDatagramIndex[0] and wDatagramLength[0] as is currently the case. Breaking the loop on (index2 == 0 || dg_len2 == 0) should come at the end as was previously the case and checks for index2 and dg_len2 should be removed since zero is valid. I'm not sure how much testing the above patch received but for me right now after enumeration ping doesn't work. Reverting the commit restores ping, scp, etc. The extra validation associated with wDatagramIndex[0] and wDatagramLength[0] appears to be valid so, this change removes the incorrect restriction on wDatagramIndex[1] and wDatagramLength[1] restoring data processing between host and device. Fixes: 2b74b0a04d3e ("USB: gadget: f_ncm: add bounds checks to ncm_unwrap_ntb()") Cc: Ilja Van Sprundel Cc: Brooke Basile Cc: stable Signed-off-by: Bryan O'Donoghue Link: https://lore.kernel.org/r/20200920170158.1217068-1-bryan.odonoghue@linaro.org Signed-off-by: Greg Kroah-Hartman --- drivers/usb/gadget/function/f_ncm.c | 30 ++---------------------------- 1 file changed, 2 insertions(+), 28 deletions(-) --- a/drivers/usb/gadget/function/f_ncm.c +++ b/drivers/usb/gadget/function/f_ncm.c @@ -1192,7 +1192,6 @@ static int ncm_unwrap_ntb(struct gether const struct ndp_parser_opts *opts = ncm->parser_opts; unsigned crc_len = ncm->is_crc ? sizeof(uint32_t) : 0; int dgram_counter; - bool ndp_after_header; /* dwSignature */ if (get_unaligned_le32(tmp) != opts->nth_sign) { @@ -1219,7 +1218,6 @@ static int ncm_unwrap_ntb(struct gether } ndp_index = get_ncm(&tmp, opts->ndp_index); - ndp_after_header = false; /* Run through all the NDP's in the NTB */ do { @@ -1235,8 +1233,6 @@ static int ncm_unwrap_ntb(struct gether ndp_index); goto err; } - if (ndp_index == opts->nth_size) - ndp_after_header = true; /* * walk through NDP @@ -1315,37 +1311,13 @@ static int ncm_unwrap_ntb(struct gether index2 = get_ncm(&tmp, opts->dgram_item_len); dg_len2 = get_ncm(&tmp, opts->dgram_item_len); - if (index2 == 0 || dg_len2 == 0) - break; - /* wDatagramIndex[1] */ - if (ndp_after_header) { - if (index2 < opts->nth_size + opts->ndp_size) { - INFO(port->func.config->cdev, - "Bad index: %#X\n", index2); - goto err; - } - } else { - if (index2 < opts->nth_size + opts->dpe_size) { - INFO(port->func.config->cdev, - "Bad index: %#X\n", index2); - goto err; - } - } if (index2 > block_len - opts->dpe_size) { INFO(port->func.config->cdev, "Bad index: %#X\n", index2); goto err; } - /* wDatagramLength[1] */ - if ((dg_len2 < 14 + crc_len) || - (dg_len2 > frame_max)) { - INFO(port->func.config->cdev, - "Bad dgram length: %#X\n", dg_len); - goto err; - } - /* * Copy the data into a new skb. * This ensures the truesize is correct @@ -1362,6 +1334,8 @@ static int ncm_unwrap_ntb(struct gether ndp_len -= 2 * (opts->dgram_item_len * 2); dgram_counter++; + if (index2 == 0 || dg_len2 == 0) + break; } while (ndp_len > 2 * (opts->dgram_item_len * 2)); } while (ndp_index);