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 28188CA9EBC for ; Sun, 27 Oct 2019 21:38:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E4BDA205F4 for ; Sun, 27 Oct 2019 21:38:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1572212314; bh=DNogohxJudpJgaAhRb6Da2/JiIzdCiOlJWxWHOT7MTo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=lM6OnXsBlNsm5IPw7tT7TvkBnR4r0S5rejCwvJmwdLD47kGNbhofU8uEEQwwiLaRl GFyWyNkoLEivJ9vtyNjHT5rVio096OroMtGyYYlJ4Dge6RJNG4kuRIx+Nt2n8NFLD/ TUBonkxqbnLxgw+g0cq85vOUJ/zvR74pek6W8Icc= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728305AbfJ0VDX (ORCPT ); Sun, 27 Oct 2019 17:03:23 -0400 Received: from mail.kernel.org ([198.145.29.99]:48526 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728267AbfJ0VDQ (ORCPT ); Sun, 27 Oct 2019 17:03:16 -0400 Received: from localhost (100.50.158.77.rev.sfr.net [77.158.50.100]) (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 A06BF2064A; Sun, 27 Oct 2019 21:03:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1572210196; bh=DNogohxJudpJgaAhRb6Da2/JiIzdCiOlJWxWHOT7MTo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=gYgVtlVHFp6BGJJRKOJZI79hNqZdHepnQAZy/lc6WqY4K6emuYyGm6FEOOwe1xOpS 0Af3FEqBDgGHwejDLEVhdEFvi0I9I6Rrn09EAq7Y+Bp6kRTiCWD3SjRVVVvHUV4dfW 7hnZ/NRpTUb2XVfKdqS9cFXLFoNsrIcPZlNRTnk8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, syzbot+cd24df4d075c319ebfc5@syzkaller.appspotmail.com, Johan Hovold Subject: [PATCH 4.4 23/41] USB: usblp: fix use-after-free on disconnect Date: Sun, 27 Oct 2019 22:01:01 +0100 Message-Id: <20191027203119.192858701@linuxfoundation.org> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191027203056.220821342@linuxfoundation.org> References: <20191027203056.220821342@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 7a759197974894213621aa65f0571b51904733d6 upstream. A recent commit addressing a runtime PM use-count regression, introduced a use-after-free by not making sure we held a reference to the struct usb_interface for the lifetime of the driver data. Fixes: 9a31535859bf ("USB: usblp: fix runtime PM after driver unbind") Cc: stable Reported-by: syzbot+cd24df4d075c319ebfc5@syzkaller.appspotmail.com Signed-off-by: Johan Hovold Link: https://lore.kernel.org/r/20191015175522.18490-1-johan@kernel.org Signed-off-by: Greg Kroah-Hartman --- drivers/usb/class/usblp.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) --- a/drivers/usb/class/usblp.c +++ b/drivers/usb/class/usblp.c @@ -458,6 +458,7 @@ static void usblp_cleanup(struct usblp * kfree(usblp->readbuf); kfree(usblp->device_id_string); kfree(usblp->statusbuf); + usb_put_intf(usblp->intf); kfree(usblp); } @@ -1120,7 +1121,7 @@ static int usblp_probe(struct usb_interf init_waitqueue_head(&usblp->wwait); init_usb_anchor(&usblp->urbs); usblp->ifnum = intf->cur_altsetting->desc.bInterfaceNumber; - usblp->intf = intf; + usblp->intf = usb_get_intf(intf); /* Malloc device ID string buffer to the largest expected length, * since we can re-query it on an ioctl and a dynamic string @@ -1209,6 +1210,7 @@ abort: kfree(usblp->readbuf); kfree(usblp->statusbuf); kfree(usblp->device_id_string); + usb_put_intf(usblp->intf); kfree(usblp); abort_ret: return retval;