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=ham 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 32D5CECE599 for ; Wed, 16 Oct 2019 22:21:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0AE98207FF for ; Wed, 16 Oct 2019 22:21:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1571264485; bh=gSHT5nwhuBITXuAxDeFbYLByEHnhOE5H5fgoKH0A+fk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=vMtOEeLCmwgQu6uVvb9jogCdEVSQOZhPMX/CQhVHn/aCEl6+/uyv9LZLOcvEGELzB bPtusj6OaVWQE4B8+ruXlIP7G84Cs3g0fV2Qxd5WYhO0+PjBYmnFemdBH95HWdNWAG SlSp5Wuave9L9tZYcWB+sCXq5GYhMAIXSFht9+ls= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2407588AbfJPWVX (ORCPT ); Wed, 16 Oct 2019 18:21:23 -0400 Received: from mail.kernel.org ([198.145.29.99]:42580 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2437544AbfJPVxf (ORCPT ); Wed, 16 Oct 2019 17:53:35 -0400 Received: from localhost (unknown [192.55.54.58]) (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 47BF2218DE; Wed, 16 Oct 2019 21:53:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1571262815; bh=gSHT5nwhuBITXuAxDeFbYLByEHnhOE5H5fgoKH0A+fk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=XGNS2i8Xs4lYPRx3atMw0XWIHHpX/VLk1l0QsHfLh/ChdbIwWaXhMZpum5LPQGr0s NYMBxD4Ya1pgkWzL7jTqS3fuvuuXOsHukBGX7Fw007TXkcKcxTke0As/LrMHSYNeYi 9LU8BPfFWW+Ebuop7TzXs77c/LHxm0dp+WZPDzM8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Johan Hovold Subject: [PATCH 4.4 40/79] USB: adutux: fix NULL-derefs on disconnect Date: Wed, 16 Oct 2019 14:50:15 -0700 Message-Id: <20191016214802.465136845@linuxfoundation.org> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191016214729.758892904@linuxfoundation.org> References: <20191016214729.758892904@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: Johan Hovold commit b2fa7baee744fde746c17bc1860b9c6f5c2eebb7 upstream. The driver was using its struct usb_device pointer as an inverted disconnected flag, but was setting it to NULL before making sure all completion handlers had run. This could lead to a NULL-pointer dereference in a number of dev_dbg statements in the completion handlers which relies on said pointer. The pointer was also dereferenced unconditionally in a dev_dbg statement release() something which would lead to a NULL-deref whenever a device was disconnected before the final character-device close if debugging was enabled. Fix this by unconditionally stopping all I/O and preventing resubmissions by poisoning the interrupt URBs at disconnect and using a dedicated disconnected flag. This also makes sure that all I/O has completed by the time the disconnect callback returns. Fixes: 1ef37c6047fe ("USB: adutux: remove custom debug macro and module parameter") Fixes: 66d4bc30d128 ("USB: adutux: remove custom debug macro") Cc: stable # 3.12 Signed-off-by: Johan Hovold Link: https://lore.kernel.org/r/20190925092913.8608-2-johan@kernel.org Signed-off-by: Greg Kroah-Hartman --- drivers/usb/misc/adutux.c | 16 ++++++++++------ 1 file changed, 10 insertions(+), 6 deletions(-) --- a/drivers/usb/misc/adutux.c +++ b/drivers/usb/misc/adutux.c @@ -80,6 +80,7 @@ struct adu_device { char serial_number[8]; int open_count; /* number of times this port has been opened */ + unsigned long disconnected:1; char *read_buffer_primary; int read_buffer_length; @@ -121,7 +122,7 @@ static void adu_abort_transfers(struct a { unsigned long flags; - if (dev->udev == NULL) + if (dev->disconnected) return; /* shutdown transfer */ @@ -244,7 +245,7 @@ static int adu_open(struct inode *inode, } dev = usb_get_intfdata(interface); - if (!dev || !dev->udev) { + if (!dev) { retval = -ENODEV; goto exit_no_device; } @@ -327,7 +328,7 @@ static int adu_release(struct inode *ino } adu_release_internal(dev); - if (dev->udev == NULL) { + if (dev->disconnected) { /* the device was unplugged before the file was released */ if (!dev->open_count) /* ... and we're the last user */ adu_delete(dev); @@ -356,7 +357,7 @@ static ssize_t adu_read(struct file *fil return -ERESTARTSYS; /* verify that the device wasn't unplugged */ - if (dev->udev == NULL) { + if (dev->disconnected) { retval = -ENODEV; pr_err("No device or device unplugged %d\n", retval); goto exit; @@ -525,7 +526,7 @@ static ssize_t adu_write(struct file *fi goto exit_nolock; /* verify that the device wasn't unplugged */ - if (dev->udev == NULL) { + if (dev->disconnected) { retval = -ENODEV; pr_err("No device or device unplugged %d\n", retval); goto exit; @@ -805,11 +806,14 @@ static void adu_disconnect(struct usb_in usb_deregister_dev(interface, &adu_class); + usb_poison_urb(dev->interrupt_in_urb); + usb_poison_urb(dev->interrupt_out_urb); + mutex_lock(&adutux_mutex); usb_set_intfdata(interface, NULL); mutex_lock(&dev->mtx); /* not interruptible */ - dev->udev = NULL; /* poison */ + dev->disconnected = 1; mutex_unlock(&dev->mtx); /* if the device is not opened, then we clean up right now */