From patchwork Thu Dec 15 05:29:06 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Udipto Goswami X-Patchwork-Id: 13073905 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C6039C4332F for ; Thu, 15 Dec 2022 05:29:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229453AbiLOF3r (ORCPT ); Thu, 15 Dec 2022 00:29:47 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51778 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229724AbiLOF3m (ORCPT ); Thu, 15 Dec 2022 00:29:42 -0500 Received: from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com [205.220.168.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1675258BFE for ; Wed, 14 Dec 2022 21:29:39 -0800 (PST) Received: from pps.filterd (m0279865.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 2BF4JSeo012101; Thu, 15 Dec 2022 05:29:36 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-type; s=qcppdkim1; bh=6fvKbFcEviEnvVYhTJalpBhLZTlAyMU/86X8rCLtjGQ=; b=L6aOOqnPTSSOlcxF+Nc2ke3dX+q6VABvs1QJb40LxfNQJ7G1vk9TeXvBgY4YrB3kaRKx bdIKv44nlG+ZYjD1IVS+pRGDvuOq0nYT89rx+EGXERTJBI0QX3ITSe7bRiVgUilOHmiA RnwQkR+n1yQWLeh1HpFv1+P1P0U0tXLmi5QmcPfi8PIqQu3B3E59LDYSC/F2jePmnyDF 1eMjFsUJ6tw5IvMffgXnNKvk7xQLTp3sQwpKyWtNeyiB69JDoMFvSaYAwrKc3KZz6/Zf Rmv2tpbRL4sfYAAJr9Jvi8rKubyYBzyC/qLtDsNQnoThV5WtbCaLR6ZbmDZWsnUkqcC7 Xg== Received: from nalasppmta04.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3mf6rd3927-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 15 Dec 2022 05:29:36 +0000 Received: from nalasex01a.na.qualcomm.com (nalasex01a.na.qualcomm.com [10.47.209.196]) by NALASPPMTA04.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 2BF5Tak7029307 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 15 Dec 2022 05:29:36 GMT Received: from hu-ugoswami-hyd.qualcomm.com (10.80.80.8) by nalasex01a.na.qualcomm.com (10.47.209.196) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.36; Wed, 14 Dec 2022 21:29:33 -0800 From: Udipto Goswami To: John Keeping , Greg Kroah-Hartman , CC: Jack Pham , Pratham Pratap , Wesley Cheng , "Udipto Goswami" Subject: [PATCH v4 2/2] usb: gadget: f_fs: Ensure ep0req is dequeued before free_request Date: Thu, 15 Dec 2022 10:59:06 +0530 Message-ID: <20221215052906.8993-3-quic_ugoswami@quicinc.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20221215052906.8993-1-quic_ugoswami@quicinc.com> References: <20221215052906.8993-1-quic_ugoswami@quicinc.com> MIME-Version: 1.0 X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01a.na.qualcomm.com (10.52.223.231) To nalasex01a.na.qualcomm.com (10.47.209.196) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: iM-f4pa05bir1rgxJ6tx_PEWO7Z0OSbQ X-Proofpoint-ORIG-GUID: iM-f4pa05bir1rgxJ6tx_PEWO7Z0OSbQ X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.923,Hydra:6.0.545,FMLib:17.11.122.1 definitions=2022-12-15_02,2022-12-14_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 malwarescore=0 bulkscore=0 lowpriorityscore=0 phishscore=0 mlxlogscore=432 suspectscore=0 spamscore=0 adultscore=0 impostorscore=0 mlxscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2212070000 definitions=main-2212150041 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org As per the documentation, function usb_ep_free_request guarantees the request will not be queued or no longer be re-queued (or otherwise used). However, with the current implementation it doesn't make sure that the request in ep0 isn't reused. Fix this by dequeuing the ep0req on functionfs_unbind before freeing the request to align with the definition. Fixes: ddf8abd25994 ("USB: f_fs: the FunctionFS driver") Signed-off-by: Udipto Goswami --- drivers/usb/gadget/function/f_fs.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c index bb6fe1f3a29d..523a961b910b 100644 --- a/drivers/usb/gadget/function/f_fs.c +++ b/drivers/usb/gadget/function/f_fs.c @@ -1895,6 +1895,8 @@ static void functionfs_unbind(struct ffs_data *ffs) ENTER(); if (!WARN_ON(!ffs->gadget)) { + /* dequeue before freeing ep0req */ + usb_ep_dequeue(ffs->gadget->ep0, ffs->ep0req); mutex_lock(&ffs->mutex); usb_ep_free_request(ffs->gadget->ep0, ffs->ep0req); ffs->ep0req = NULL;