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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 CB46BC4332E for ; Thu, 19 Mar 2020 13:29:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A3701207FC for ; Thu, 19 Mar 2020 13:29:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1584624551; bh=MdM4dmvB1NrI3FG6lrkvPkf35G6mA0uFNk6ScnH/2ew=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=mnEJAn7EE4jGpmLwy+CWD/z/iCFEcCoZce5aAjvtqDQW4FCULyNV+waf98Sr+XJ9e dm0+Swz+MGOVSBzAUeKdPwrZv3wsnOF69+ixBrbP/xvNUIr0phId2C9XlqLrvHzGWY kOms/SNX/9y3xMgZcWGfVJLgchdoRt7BTx8CiOZA= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727753AbgCSNZL (ORCPT ); Thu, 19 Mar 2020 09:25:11 -0400 Received: from mail.kernel.org ([198.145.29.99]:52612 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730592AbgCSNZL (ORCPT ); Thu, 19 Mar 2020 09:25:11 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (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 5762620B1F; Thu, 19 Mar 2020 13:25:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1584624310; bh=MdM4dmvB1NrI3FG6lrkvPkf35G6mA0uFNk6ScnH/2ew=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=pqzBPi81/1+3wCS07o1wz2SsLX79VvASdikiZh+GQPBrboW1zVVVbX6hOyIs72c7c W0KhQRoicgml7FelRWWg/BCS+E96zShPM+e8/H/7BMZhybbNv7JGqB34BIZfptr7VN /Eob8+x6VbeHGlR+2piiLbrpBhYwddNn3n6tZgUg= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Hanno Zulla , Benjamin Tissoires , Sasha Levin Subject: [PATCH 5.5 18/65] HID: hid-bigbenff: fix race condition for scheduled work during removal Date: Thu, 19 Mar 2020 14:04:00 +0100 Message-Id: <20200319123932.165773859@linuxfoundation.org> X-Mailer: git-send-email 2.25.2 In-Reply-To: <20200319123926.466988514@linuxfoundation.org> References: <20200319123926.466988514@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Hanno Zulla [ Upstream commit 4eb1b01de5b9d8596d6c103efcf1a15cfc1bedf7 ] It's possible that there is scheduled work left while the device is already being removed, which can cause a kernel crash. Adding a flag will avoid this. Signed-off-by: Hanno Zulla Signed-off-by: Benjamin Tissoires Signed-off-by: Sasha Levin --- drivers/hid/hid-bigbenff.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/hid/hid-bigbenff.c b/drivers/hid/hid-bigbenff.c index f8c552b64a899..db6da21ade063 100644 --- a/drivers/hid/hid-bigbenff.c +++ b/drivers/hid/hid-bigbenff.c @@ -174,6 +174,7 @@ static __u8 pid0902_rdesc_fixed[] = { struct bigben_device { struct hid_device *hid; struct hid_report *report; + bool removed; u8 led_state; /* LED1 = 1 .. LED4 = 8 */ u8 right_motor_on; /* right motor off/on 0/1 */ u8 left_motor_force; /* left motor force 0-255 */ @@ -190,6 +191,9 @@ static void bigben_worker(struct work_struct *work) struct bigben_device, worker); struct hid_field *report_field = bigben->report->field[0]; + if (bigben->removed) + return; + if (bigben->work_led) { bigben->work_led = false; report_field->value[0] = 0x01; /* 1 = led message */ @@ -304,6 +308,7 @@ static void bigben_remove(struct hid_device *hid) { struct bigben_device *bigben = hid_get_drvdata(hid); + bigben->removed = true; cancel_work_sync(&bigben->worker); hid_hw_stop(hid); } @@ -324,6 +329,7 @@ static int bigben_probe(struct hid_device *hid, return -ENOMEM; hid_set_drvdata(hid, bigben); bigben->hid = hid; + bigben->removed = false; error = hid_parse(hid); if (error) { -- 2.20.1