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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,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 99FB1C32753 for ; Wed, 14 Aug 2019 17:09:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6219F214DA for ; Wed, 14 Aug 2019 17:09:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1565802591; bh=UA/Qg49npwevYF1Z6UcRLmqGtITlBDjcFMc7R9mYah0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=SWatlcmTfup5faqI25u6rorIpVN7ZfKZEv41IQjWk7OM9hmhMn7E8MXNhHhOUML6n c54nbcpjSBCIDQ5SFjViB42D+MBJqz/u1DKdvJbHeypGfgx2eI+UKo8JV0HRApqYp5 N2MsKzujAZLent6fyRJmL7roKRLnbbk6vM9HwJ60= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729685AbfHNRJu (ORCPT ); Wed, 14 Aug 2019 13:09:50 -0400 Received: from mail.kernel.org ([198.145.29.99]:60288 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730388AbfHNRJp (ORCPT ); Wed, 14 Aug 2019 13:09:45 -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 9D5C52084D; Wed, 14 Aug 2019 17:09:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1565802585; bh=UA/Qg49npwevYF1Z6UcRLmqGtITlBDjcFMc7R9mYah0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=wOsdVI1vw2KZeL5235jZMQY9vhSd2l1xd29oOTdfcL4QWAr/z0vipVeEX17U8YirY mnkaBroDDr+e9jiUbPz2zJvEsbPUtcffgRwp0st/4KcmsGJrbqel6yHcii1O8tSsrg Qg+JOPALcn4xMBSKqgoHfHORHeHFeUCiQe1nOaZQ= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, syzbot+a64a382964bf6c71a9c0@syzkaller.appspotmail.com, Oliver Neukum Subject: [PATCH 4.19 09/91] usb: iowarrior: fix deadlock on disconnect Date: Wed, 14 Aug 2019 19:00:32 +0200 Message-Id: <20190814165749.924852896@linuxfoundation.org> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20190814165748.991235624@linuxfoundation.org> References: <20190814165748.991235624@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Oliver Neukum commit c468a8aa790e0dfe0a7f8a39db282d39c2c00b46 upstream. We have to drop the mutex before we close() upon disconnect() as close() needs the lock. This is safe to do by dropping the mutex as intfdata is already set to NULL, so open() will fail. Fixes: 03f36e885fc26 ("USB: open disconnect race in iowarrior") Reported-by: syzbot+a64a382964bf6c71a9c0@syzkaller.appspotmail.com Cc: stable Signed-off-by: Oliver Neukum Link: https://lore.kernel.org/r/20190808092728.23417-1-oneukum@suse.com Signed-off-by: Greg Kroah-Hartman --- drivers/usb/misc/iowarrior.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) --- a/drivers/usb/misc/iowarrior.c +++ b/drivers/usb/misc/iowarrior.c @@ -866,19 +866,20 @@ static void iowarrior_disconnect(struct dev = usb_get_intfdata(interface); mutex_lock(&iowarrior_open_disc_lock); usb_set_intfdata(interface, NULL); + /* prevent device read, write and ioctl */ + dev->present = 0; minor = dev->minor; + mutex_unlock(&iowarrior_open_disc_lock); + /* give back our minor - this will call close() locks need to be dropped at this point*/ - /* give back our minor */ usb_deregister_dev(interface, &iowarrior_class); mutex_lock(&dev->mutex); /* prevent device read, write and ioctl */ - dev->present = 0; mutex_unlock(&dev->mutex); - mutex_unlock(&iowarrior_open_disc_lock); if (dev->opened) { /* There is a process that holds a filedescriptor to the device ,