From patchwork Thu Sep 17 14:41:51 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "M. Vefa Bicakci" X-Patchwork-Id: 11782683 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 130CE618 for ; Thu, 17 Sep 2020 14:44:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 527A12075B for ; Thu, 17 Sep 2020 14:44:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727685AbgIQOng (ORCPT ); Thu, 17 Sep 2020 10:43:36 -0400 Received: from aibo.runbox.com ([91.220.196.211]:44960 "EHLO aibo.runbox.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727641AbgIQOmQ (ORCPT ); Thu, 17 Sep 2020 10:42:16 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=runbox.com; s=selector2; h=Content-Transfer-Encoding:MIME-Version:References:In-Reply-To :Message-Id:Date:Subject:Cc:To:From; bh=jYC5vfpyAOB01Xz9fU7PjyTQCLGjlSBNPFV1rX8wF80=; b=UdIyK5YcbcJK/sE20vl9eIdY+0 7Yuwn/2NTwL2mPvPbiwx+wmxKwJ/2E3jSMUZ48DFehw6Sr1pkR4vPZN24T+Smi+iTkCS185isl9V9 VpV7avfNrKsAPgUHUZAJTiQt7ucOtwFlM7A7nq6E7MXaLuMZiQ1b9FiFfIt7vml6PJ0wLYwwdX/kK pS4kw/8+Ezf6SPMhEZffiohd8jKkWR0JU4l/1clxSvCvtgxf31OkwUhsk39hV3fk+lWrdBR+qKWSz oPJm/avtxGWfBCJw9Ovupm0nWEmMJ6lvr8wX0dCK0+s4qtBD3VwMAo1T3WkH8JpyWgfRMPDwGbSJc GYIag1lA==; Received: from [10.9.9.72] (helo=submission01.runbox) by mailtransmit02.runbox with esmtp (Exim 4.86_2) (envelope-from ) id 1kIv6y-0001Ko-KU; Thu, 17 Sep 2020 16:42:12 +0200 Received: by submission01.runbox with esmtpsa [Authenticated alias (536975)] (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) id 1kIv6p-0002ee-CS; Thu, 17 Sep 2020 16:42:03 +0200 From: "M. Vefa Bicakci" To: linux-usb@vger.kernel.org Cc: "M. Vefa Bicakci" , Andrey Konovalov , stable@vger.kernel.org, Bastien Nocera , Valentina Manea , Shuah Khan , Greg Kroah-Hartman , Alan Stern , syzkaller@googlegroups.com Subject: [PATCH 3/3] usbip: Make the driver's match function specific Date: Thu, 17 Sep 2020 17:41:51 +0300 Message-Id: <20200917144151.355848-3-m.v.b@runbox.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200917144151.355848-1-m.v.b@runbox.com> References: <20200917144151.355848-1-m.v.b@runbox.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Prior to this commit, the USB-IP subsystem's USB device driver match function used to match all USB devices (by returning true unconditionally). Unfortunately, this is not correct behaviour and is likely the root cause of the bug reported by Andrey Konovalov. USB-IP should only match USB devices that the user-space asked the kernel to handle via USB-IP, by writing to the match_busid sysfs file, which is what this commit aims to achieve. This is done by making the match function check that the passed in USB device was indeed requested by the user-space to be handled by USB-IP. Reported-by: Andrey Konovalov Fixes: 7a2f2974f2 ("usbip: Implement a match function to fix usbip") Link: https://lore.kernel.org/linux-usb/CAAeHK+zOrHnxjRFs=OE8T=O9208B9HP_oo8RZpyVOZ9AJ54pAA@mail.gmail.com/ Cc: # 5.8 Cc: Bastien Nocera Cc: Valentina Manea Cc: Shuah Khan Cc: Greg Kroah-Hartman Cc: Alan Stern Cc: Signed-off-by: M. Vefa Bicakci --- drivers/usb/usbip/stub_dev.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) diff --git a/drivers/usb/usbip/stub_dev.c b/drivers/usb/usbip/stub_dev.c index 9d7d642022d1..3d9c8ff6762e 100644 --- a/drivers/usb/usbip/stub_dev.c +++ b/drivers/usb/usbip/stub_dev.c @@ -463,7 +463,20 @@ static void stub_disconnect(struct usb_device *udev) static bool usbip_match(struct usb_device *udev) { - return true; + bool match; + struct bus_id_priv *busid_priv; + const char *udev_busid = dev_name(&udev->dev); + + busid_priv = get_busid_priv(udev_busid); + if (!busid_priv) + return false; + + match = (busid_priv->status != STUB_BUSID_REMOV && + busid_priv->status != STUB_BUSID_OTHER); + + put_busid_priv(busid_priv); + + return match; } #ifdef CONFIG_PM