From patchwork Wed Oct 27 08:08:18 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Johan Hovold X-Patchwork-Id: 12586583 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 728B6C43217 for ; Wed, 27 Oct 2021 08:12:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5CC1A60C40 for ; Wed, 27 Oct 2021 08:12:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240813AbhJ0IOp (ORCPT ); Wed, 27 Oct 2021 04:14:45 -0400 Received: from mail.kernel.org ([198.145.29.99]:46438 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240785AbhJ0IOn (ORCPT ); Wed, 27 Oct 2021 04:14:43 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 8D00460F6F; 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=OgMrTYLYFTRq1xURZC/7AxyMSuua7/BgrWAb5qpfMkk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ijLYPecgsamDQTyxBtxqxH85QnhztnkIywWYpFqbyhXWF5Po1XNCMAd/XjnjDo2h4 Tv6wm/p1HabaQ6jCks/VjVHbwE7Ig3WhqwhHaQZPMPI7o43oDFPEGXvOeWtwc6D4dq js+nUhJOcxed14IO0RzP07OjBhwIOsKe/YBvJp/j6nZe7nCq2NKry5WTPCLgzkvwrm pqyrCA/z0ZfpOG4BnlId3tEEauk3/CtQDhcZhAurZLh9RFPnwYqVCJZt+rrsw1OJss oxQO1kTcvz7flPqDc57Q2JfMKPvJYxysdbQaFt+uIhMm7oj78fm9gAksw/AoQDeaSL nAj3VHNmTU54A== Received: from johan by xi.lan with local (Exim 4.94.2) (envelope-from ) id 1mfe2S-0001li-Sx; 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 Subject: [PATCH v2 2/3] ath6kl: fix division by zero in send path Date: Wed, 27 Oct 2021 10:08:18 +0200 Message-Id: <20211027080819.6675-3-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-usb@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: 9cbee358687e ("ath6kl: add full USB support") Cc: stable@vger.kernel.org # 3.5 Signed-off-by: Johan Hovold --- drivers/net/wireless/ath/ath6kl/usb.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/net/wireless/ath/ath6kl/usb.c b/drivers/net/wireless/ath/ath6kl/usb.c index bd367b79a4d3..aba70f35e574 100644 --- a/drivers/net/wireless/ath/ath6kl/usb.c +++ b/drivers/net/wireless/ath/ath6kl/usb.c @@ -340,6 +340,11 @@ static int ath6kl_usb_setup_pipe_resources(struct ath6kl_usb *ar_usb) le16_to_cpu(endpoint->wMaxPacketSize), endpoint->bInterval); } + + /* Ignore broken descriptors. */ + if (usb_endpoint_maxp(endpoint) == 0) + continue; + urbcount = 0; pipe_num =