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 AA9CDC2BB55 for ; Thu, 16 Apr 2020 15:45:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 84F7E20732 for ; Thu, 16 Apr 2020 15:45:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1587051921; bh=Zdg/vgCZtVzpvtzNd6vjcd/5iwmO3Je1o3bPcCol/5I=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=t6trbU9udG40FHQh/q+shGS5jjNhA+PLB6BLSfcA4Xgn+wRBKfKcNPsBMIXJDZESv nfqlEZc6S38Eg0BPRVF6PIfcfduJ73ac57eL2HNxHKfu8yIXYhBk0SNv2nWj7SAZ6x b93u81nPIsU1PIGNstKjXqD3uUM7oh6Uz0X7ZPRs= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2894721AbgDPPpT (ORCPT ); Thu, 16 Apr 2020 11:45:19 -0400 Received: from mail.kernel.org ([198.145.29.99]:47006 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2897055AbgDPNfK (ORCPT ); Thu, 16 Apr 2020 09:35:10 -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 88B9621BE5; Thu, 16 Apr 2020 13:35:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1587044109; bh=Zdg/vgCZtVzpvtzNd6vjcd/5iwmO3Je1o3bPcCol/5I=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=VlZic/oF+ZC1w58phC3KI18MzdtF5MVBigVtTA8UukFeV+aZbu+caRRtvN5LgUdT0 lFQ74Z8eHl2/yig9/9/5x50yXdUWQUDaF2lX64IHo0w/sbGOBf22pCpdmS4kF1R77G L2CBCYbGGzdaz0puU06AIXIcOak7i79eTFXgN2qs= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Sriharsha Allenki , Peter Chen Subject: [PATCH 5.5 085/257] usb: gadget: f_fs: Fix use after free issue as part of queue failure Date: Thu, 16 Apr 2020 15:22:16 +0200 Message-Id: <20200416131336.594045522@linuxfoundation.org> X-Mailer: git-send-email 2.26.1 In-Reply-To: <20200416131325.891903893@linuxfoundation.org> References: <20200416131325.891903893@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: Sriharsha Allenki commit f63ec55ff904b2f2e126884fcad93175f16ab4bb upstream. In AIO case, the request is freed up if ep_queue fails. However, io_data->req still has the reference to this freed request. In the case of this failure if there is aio_cancel call on this io_data it will lead to an invalid dequeue operation and a potential use after free issue. Fix this by setting the io_data->req to NULL when the request is freed as part of queue failure. Fixes: 2e4c7553cd6f ("usb: gadget: f_fs: add aio support") Signed-off-by: Sriharsha Allenki CC: stable Reviewed-by: Peter Chen Link: https://lore.kernel.org/r/20200326115620.12571-1-sallenki@codeaurora.org Signed-off-by: Greg Kroah-Hartman --- drivers/usb/gadget/function/f_fs.c | 1 + 1 file changed, 1 insertion(+) --- a/drivers/usb/gadget/function/f_fs.c +++ b/drivers/usb/gadget/function/f_fs.c @@ -1120,6 +1120,7 @@ static ssize_t ffs_epfile_io(struct file ret = usb_ep_queue(ep->ep, req, GFP_ATOMIC); if (unlikely(ret)) { + io_data->req = NULL; usb_ep_free_request(ep->ep, req); goto error_lock; }