From patchwork Mon Sep 26 20:22:35 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Enrik Berkhan X-Patchwork-Id: 609457 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 7AE60C6FA90 for ; Mon, 26 Sep 2022 20:50:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230209AbiIZUus (ORCPT ); Mon, 26 Sep 2022 16:50:48 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34590 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229998AbiIZUur (ORCPT ); Mon, 26 Sep 2022 16:50:47 -0400 Received: from mail.inka.de (mail.inka.de [IPv6:2a04:c9c7:0:1073:217:a4ff:fe3b:e77c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 217FA3AE77 for ; Mon, 26 Sep 2022 13:50:44 -0700 (PDT) Received: from mail3.berkhan-weisser.de ([2a03:4000:54:b9a::4]) by mail.inka.de with esmtpsa id 1ocudK-003t0e-S6; Mon, 26 Sep 2022 22:23:18 +0200 Received: from 127.0.0.1 (helo=localhost.localdomain) by mail3.berkhan-weisser.de with esmtpsa (TLS1.3:ECDHE_X25519__RSA_PSS_RSAE_SHA256__AES_256_GCM:256) (Exim 4.94.2) (envelope-from ) id 1ocudK-007Trr-Ce; Mon, 26 Sep 2022 22:23:18 +0200 From: Enrik Berkhan To: linux-input@vger.kernel.org Cc: linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org, Rishi Gupta , Enrik Berkhan Subject: [RESEND PATCH v1 0/4] Fixes for the mcp2221 HID-to-I2C-bridge driver Date: Mon, 26 Sep 2022 22:22:35 +0200 Message-Id: <20220926202239.16379-1-Enrik.Berkhan@inka.de> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org In this patch series are fixes for issues I found during recent tests of an MCP2221 board. - you can confuse the kernel driver when using the chip from user mode via /dev/hidrawX, typically leading to a NULL pointer dereference in the driver's HID raw event handler - the driver needs > 15s to initialize because the HID raw handling is not enabled during initialization of the GPIO part - data shared with the bottom half code is not protected from concurrent access - the rxbuf pointer can become invalid or even stale if the device would send unsolicited reports Enrik Berkhan (4): HID: mcp2221: don't connect hidraw HID: mcp2221: enable HID I/O during GPIO probe HID: mcp2221: protect shared data with spin lock HID: mcp2221: avoid stale rxbuf pointer drivers/hid/hid-mcp2221.c | 114 ++++++++++++++++++++++++++++++++------ 1 file changed, 97 insertions(+), 17 deletions(-) --- Resend because I had a typo in the linux-input mailing list address. Also adding linux-kernel to increase visibility.