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 X-Spam-Level: X-Spam-Status: No, score=-13.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 7F2A3C433E2 for ; Mon, 20 Jul 2020 21:37:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4F9B0207FC for ; Mon, 20 Jul 2020 21:37:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1595281045; bh=CNA2UcGDHuCk9lpCPB6VSEaq6G3lroCk8+yxTtXAEhs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=QwbzqeK6Rgg0XZJokFgCnsDLVdGDp6pnZ3up8MkCzo1GISZ4ku+k7u2fdlcixECL8 q9adpf5Gpw2MLq7rn4Gz+eW74gf/BawXBcm4Y7zLUQ28p44feVwp3JUgvYkOvMsdP+ a2udcRJ9mCob+bNX3gXccvjHIGCp06mdhRe0Fd6s= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726949AbgGTVhX (ORCPT ); Mon, 20 Jul 2020 17:37:23 -0400 Received: from mail.kernel.org ([198.145.29.99]:55194 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726930AbgGTVhW (ORCPT ); Mon, 20 Jul 2020 17:37:22 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 71F6B207FC; Mon, 20 Jul 2020 21:37:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1595281042; bh=CNA2UcGDHuCk9lpCPB6VSEaq6G3lroCk8+yxTtXAEhs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=U9TnaTcMmAVF6LRvoveXp2CxTj9IsAmQCGvegSGEeOz6QVFSWTubf3LENJ1ywJUmK j4BTP2D9svt6an8ATL3cQDmx9La68/5HZfsdjsy0dZt5/Pifqg8gfwSEt8JIxUEqOZ N2rwumMcvEpSgW3k/xGAP7nS/ZPXl1FXwOSI7EfI= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Rodrigo Rivas Costa , Siarhei Vishniakou , Jiri Kosina , Sasha Levin , linux-input@vger.kernel.org Subject: [PATCH AUTOSEL 5.7 05/40] HID: steam: fixes race in handling device list. Date: Mon, 20 Jul 2020 17:36:40 -0400 Message-Id: <20200720213715.406997-5-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200720213715.406997-1-sashal@kernel.org> References: <20200720213715.406997-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-input-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org From: Rodrigo Rivas Costa [ Upstream commit 2d3f53a80e4eed078669853a178ed96d88f74143 ] Using uhid and KASAN this driver crashed because it was getting several connection events where it only expected one. Then the device was added several times to the static device list and it got corrupted. This patch checks if the device is already in the list before adding it. Signed-off-by: Rodrigo Rivas Costa Tested-by: Siarhei Vishniakou Signed-off-by: Jiri Kosina Signed-off-by: Sasha Levin --- drivers/hid/hid-steam.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/hid/hid-steam.c b/drivers/hid/hid-steam.c index 6286204d4c560..a3b151b29bd71 100644 --- a/drivers/hid/hid-steam.c +++ b/drivers/hid/hid-steam.c @@ -526,7 +526,8 @@ static int steam_register(struct steam_device *steam) steam_battery_register(steam); mutex_lock(&steam_devices_lock); - list_add(&steam->list, &steam_devices); + if (list_empty(&steam->list)) + list_add(&steam->list, &steam_devices); mutex_unlock(&steam_devices_lock); } @@ -552,7 +553,7 @@ static void steam_unregister(struct steam_device *steam) hid_info(steam->hdev, "Steam Controller '%s' disconnected", steam->serial_no); mutex_lock(&steam_devices_lock); - list_del(&steam->list); + list_del_init(&steam->list); mutex_unlock(&steam_devices_lock); steam->serial_no[0] = 0; } @@ -738,6 +739,7 @@ static int steam_probe(struct hid_device *hdev, mutex_init(&steam->mutex); steam->quirks = id->driver_data; INIT_WORK(&steam->work_connect, steam_work_connect_cb); + INIT_LIST_HEAD(&steam->list); steam->client_hdev = steam_create_client_hid(hdev); if (IS_ERR(steam->client_hdev)) { -- 2.25.1