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=-9.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,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 CC340C43331 for ; Thu, 26 Mar 2020 06:01:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9948020772 for ; Thu, 26 Mar 2020 06:01:24 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=mg.codeaurora.org header.i=@mg.codeaurora.org header.b="SFcPvWvm" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726210AbgCZGBY (ORCPT ); Thu, 26 Mar 2020 02:01:24 -0400 Received: from mail27.static.mailgun.info ([104.130.122.27]:41548 "EHLO mail27.static.mailgun.info" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725775AbgCZGBX (ORCPT ); Thu, 26 Mar 2020 02:01:23 -0400 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1585202483; h=Content-Transfer-Encoding: MIME-Version: Message-Id: Date: Subject: Cc: To: From: Sender; bh=RebUHKnAwQUQfOR7sYhC2NKNt76w5eJuItSeaLBWUpY=; b=SFcPvWvmwYAs2qEDt6+M1oIF4xYqPo0Ie5Kt56kuqm+bMfTus268QLnxF66KoRerg+U1lcoR iWExv3tYr5nHHscsMMyiNa0DG1+ObZsZ6gLo0HDM9cX/vQllSwB9zK4vgIA7vTz61zB0ls0v lSQXyIgrnBZSJ8RoODIO+nBpaOc= X-Mailgun-Sending-Ip: 104.130.122.27 X-Mailgun-Sid: WyIxZTE2YSIsICJsaW51eC11c2JAdmdlci5rZXJuZWwub3JnIiwgImJlOWU0YSJd Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by mxa.mailgun.org with ESMTP id 5e7c4510.7f03ef4bff10-smtp-out-n03; Thu, 26 Mar 2020 06:00:48 -0000 (UTC) Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 6ACE3C433F2; Thu, 26 Mar 2020 06:00:47 +0000 (UTC) Received: from sallenki-linux.qualcomm.com (blr-c-bdr-fw-01_GlobalNAT_AllZones-Outside.qualcomm.com [103.229.19.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: sallenki) by smtp.codeaurora.org (Postfix) with ESMTPSA id B9BFCC433D2; Thu, 26 Mar 2020 06:00:44 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org B9BFCC433D2 Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=none smtp.mailfrom=sallenki@codeaurora.org From: Sriharsha Allenki To: balbi@kernel.org, gregkh@linuxfoundation.org, linux-usb@vger.kernel.org Cc: mgautam@codeaurora.org, jackp@codeaurora.org, Sriharsha Allenki Subject: [PATCH] usb: gadget: f_fs: Fix use after free issue as part of queue failure Date: Thu, 26 Mar 2020 11:30:33 +0530 Message-Id: <20200326060033.14550-1-sallenki@codeaurora.org> X-Mailer: git-send-email 2.26.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org 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. Signed-off-by: Sriharsha Allenki --- drivers/usb/gadget/function/f_fs.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c index 571917677d35..767f30b86645 100644 --- 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 *file, struct ffs_io_data *io_data) 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; } -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project