From patchwork Wed Oct 27 08:08:17 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Johan Hovold X-Patchwork-Id: 12586595 X-Patchwork-Delegate: kvalo@adurom.com 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 08E05C43217 for ; Wed, 27 Oct 2021 08:12:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EA7A7601FF for ; Wed, 27 Oct 2021 08:12:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240815AbhJ0IOp (ORCPT ); Wed, 27 Oct 2021 04:14:45 -0400 Received: from mail.kernel.org ([198.145.29.99]:46418 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239185AbhJ0IOn (ORCPT ); Wed, 27 Oct 2021 04:14:43 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 79E26601FF; Wed, 27 Oct 2021 08:12:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1635322338; bh=1yK8f767hVuBik3p0ImJWK6GMwCNwKjgGrhZGPbIhvk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=KrO5XD2YIP373HIfFqyTW5p9wJlTqcnDT+cpbR0WBEom7XMLhRnu7COwQgBYkysjK 7hkHhO2v37+Ija7po5YchG8eHKsjZZV/g8HbyPKZlXUn5auD8v76nK/0nGQeEkEZbs v4dwBRwqwXeFCDqNc9tUVUY8/iArvt9u8dXFEI4yVKpbJ823r97mI/lgqamwdWx0dj JKHOnImv33EWEVT4yfZ64qCp9c7lmkLgVH7EGYvOL8oPY4DmxdDApXhk/cW8AfvjPa AG9/IctAFN3pPZI6RBUFAQWhHl6sTc9xk/YMfOXvX6B/cdBOXxfr88lf0msM2+ms8x rLcnMOsARrslg== Received: from johan by xi.lan with local (Exim 4.94.2) (envelope-from ) id 1mfe2S-0001lg-Ps; Wed, 27 Oct 2021 10:12:00 +0200 From: Johan Hovold To: Kalle Valo Cc: Amitkumar Karwar , Ganapathi Bhat , Sharvari Harisangam , Xinming Hu , Brian Norris , linux-wireless@vger.kernel.org, netdev@vger.kernel.org, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Johan Hovold , stable@vger.kernel.org, Erik Stromdahl Subject: [PATCH v2 1/3] ath10k: fix division by zero in send path Date: Wed, 27 Oct 2021 10:08:17 +0200 Message-Id: <20211027080819.6675-2-johan@kernel.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20211027080819.6675-1-johan@kernel.org> References: <20211027080819.6675-1-johan@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org Add the missing endpoint max-packet sanity check to probe() to avoid division by zero in ath10k_usb_hif_tx_sg() in case a malicious device has broken descriptors (or when doing descriptor fuzz testing). Note that USB core will reject URBs submitted for endpoints with zero wMaxPacketSize but that drivers doing packet-size calculations still need to handle this (cf. commit 2548288b4fb0 ("USB: Fix: Don't skip endpoint descriptors with maxpacket=0")). Fixes: 4db66499df91 ("ath10k: add initial USB support") Cc: stable@vger.kernel.org # 4.14 Cc: Erik Stromdahl Signed-off-by: Johan Hovold --- drivers/net/wireless/ath/ath10k/usb.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/net/wireless/ath/ath10k/usb.c b/drivers/net/wireless/ath/ath10k/usb.c index 6d831b098cbb..3d98f19c6ec8 100644 --- a/drivers/net/wireless/ath/ath10k/usb.c +++ b/drivers/net/wireless/ath/ath10k/usb.c @@ -853,6 +853,11 @@ static int ath10k_usb_setup_pipe_resources(struct ath10k *ar, le16_to_cpu(endpoint->wMaxPacketSize), endpoint->bInterval); } + + /* Ignore broken descriptors. */ + if (usb_endpoint_maxp(endpoint) == 0) + continue; + urbcount = 0; pipe_num =