From patchwork Sun Jan 29 04:44:21 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dai Ngo X-Patchwork-Id: 13120026 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 D32E1C61D97 for ; Sun, 29 Jan 2023 04:44:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230496AbjA2Eo5 (ORCPT ); Sat, 28 Jan 2023 23:44:57 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52368 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229436AbjA2Eo4 (ORCPT ); Sat, 28 Jan 2023 23:44:56 -0500 Received: from mx0b-00069f02.pphosted.com (mx0b-00069f02.pphosted.com [205.220.177.32]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B234122A3E for ; Sat, 28 Jan 2023 20:44:55 -0800 (PST) Received: from pps.filterd (m0246632.ppops.net [127.0.0.1]) by mx0b-00069f02.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 30T4WX5F027455; Sun, 29 Jan 2023 04:44:42 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id; s=corp-2022-7-12; bh=xVN0zEHcec2q1uG12e445ikulqX0pLq2RFabtDKC9Zs=; b=YKGPiYImOSHhkIgrp/sRr3e+dih0W4heN10YkE29KnbHRNJH2y3pzwQc685rhnz5GcjB Ez+9N+7vUw9VpYojmvNT4k6nDoEusnC6KvDCJWEGyO46ZCt67OawH34Qx3PUIdLfFX4M cG7aEYsI0G+frnDXt2xEJdYiZ18RU1Z/1iwTYP4OiZbRP4A/X9SvLp8LShdgdYw9644M 6EF3un74yWji77fhbgTPrJl6kLsCGpnz1FPyxxIGSvnsSJtlFKduf/VTLmMesmL3qZNE wkYwP6qGzcAeHBmui6nY4NOCS4/4GBfltU2v4WhgQPjTrmvrqX7pPt93K4qisgEoYQdc mQ== Received: from phxpaimrmta01.imrmtpd1.prodappphxaev1.oraclevcn.com (phxpaimrmta01.appoci.oracle.com [138.1.114.2]) by mx0b-00069f02.pphosted.com (PPS) with ESMTPS id 3ncvmhh0hc-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Sun, 29 Jan 2023 04:44:42 +0000 Received: from pps.filterd (phxpaimrmta01.imrmtpd1.prodappphxaev1.oraclevcn.com [127.0.0.1]) by phxpaimrmta01.imrmtpd1.prodappphxaev1.oraclevcn.com (8.17.1.5/8.17.1.5) with ESMTP id 30T3NcR0000797; Sun, 29 Jan 2023 04:44:41 GMT Received: from pps.reinject (localhost [127.0.0.1]) by phxpaimrmta01.imrmtpd1.prodappphxaev1.oraclevcn.com (PPS) with ESMTPS id 3nct52urc6-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Sun, 29 Jan 2023 04:44:41 +0000 Received: from phxpaimrmta01.imrmtpd1.prodappphxaev1.oraclevcn.com (phxpaimrmta01.imrmtpd1.prodappphxaev1.oraclevcn.com [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 30T4iex3034353; Sun, 29 Jan 2023 04:44:40 GMT Received: from ca-common-hq.us.oracle.com (ca-common-hq.us.oracle.com [10.211.9.209]) by phxpaimrmta01.imrmtpd1.prodappphxaev1.oraclevcn.com (PPS) with ESMTP id 3nct52urc2-1; Sun, 29 Jan 2023 04:44:40 +0000 From: Dai Ngo To: chuck.lever@oracle.com, jlayton@kernel.org Cc: aglo@umich.edu, linux-nfs@vger.kernel.org Subject: [PATCH v2 1/1] NFSD: fix problems with cleanup on errors in nfsd4_copy Date: Sat, 28 Jan 2023 20:44:21 -0800 Message-Id: <1674967461-1366-1-git-send-email-dai.ngo@oracle.com> X-Mailer: git-send-email 1.8.3.1 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.219,Aquarius:18.0.930,Hydra:6.0.562,FMLib:17.11.122.1 definitions=2023-01-29_03,2023-01-27_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxscore=0 adultscore=0 malwarescore=0 spamscore=0 phishscore=0 mlxlogscore=999 suspectscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2212070000 definitions=main-2301290046 X-Proofpoint-ORIG-GUID: Tn_D9n1wG3-1by08xs-VjsYhgoCjXcyX X-Proofpoint-GUID: Tn_D9n1wG3-1by08xs-VjsYhgoCjXcyX Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org When nfsd4_copy fails to allocate memory for async_copy->cp_src, or nfs4_init_copy_state fails, it calls cleanup_async_copy to do the cleanup for the async_copy which causes page fault since async_copy is not yet initialized. This patch rearranges the order of initializing the fields in async_copy and adds checks in cleanup_async_copy to skip un-initialized fields. Fixes: ce0887ac96d3 ("NFSD add nfs4 inter ssc to nfsd4_copy") Fixes: 87689df69491 ("NFSD: Shrink size of struct nfsd4_copy") Signed-off-by: Dai Ngo --- fs/nfsd/nfs4proc.c | 12 ++++++++---- fs/nfsd/nfs4state.c | 5 +++-- 2 files changed, 11 insertions(+), 6 deletions(-) diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c index 57f791899de3..0754b38d3a43 100644 --- a/fs/nfsd/nfs4proc.c +++ b/fs/nfsd/nfs4proc.c @@ -1687,9 +1687,12 @@ static void cleanup_async_copy(struct nfsd4_copy *copy) { nfs4_free_copy_state(copy); release_copy_files(copy); - spin_lock(©->cp_clp->async_lock); - list_del(©->copies); - spin_unlock(©->cp_clp->async_lock); + if (copy->cp_clp) { + spin_lock(©->cp_clp->async_lock); + if (!list_empty(©->copies)) + list_del(©->copies); + spin_unlock(©->cp_clp->async_lock); + } nfs4_put_copy(copy); } @@ -1786,12 +1789,13 @@ nfsd4_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, async_copy = kzalloc(sizeof(struct nfsd4_copy), GFP_KERNEL); if (!async_copy) goto out_err; + INIT_LIST_HEAD(&async_copy->copies); + refcount_set(&async_copy->refcount, 1); async_copy->cp_src = kmalloc(sizeof(*async_copy->cp_src), GFP_KERNEL); if (!async_copy->cp_src) goto out_err; if (!nfs4_init_copy_state(nn, copy)) goto out_err; - refcount_set(&async_copy->refcount, 1); memcpy(©->cp_res.cb_stateid, ©->cp_stateid.cs_stid, sizeof(copy->cp_res.cb_stateid)); dup_copy_fields(copy, async_copy); diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c index ace02fd0d590..c39e43742dd6 100644 --- a/fs/nfsd/nfs4state.c +++ b/fs/nfsd/nfs4state.c @@ -975,7 +975,6 @@ static int nfs4_init_cp_state(struct nfsd_net *nn, copy_stateid_t *stid, stid->cs_stid.si_opaque.so_clid.cl_boot = (u32)nn->boot_time; stid->cs_stid.si_opaque.so_clid.cl_id = nn->s2s_cp_cl_id; - stid->cs_type = cs_type; idr_preload(GFP_KERNEL); spin_lock(&nn->s2s_cp_lock); @@ -986,6 +985,7 @@ static int nfs4_init_cp_state(struct nfsd_net *nn, copy_stateid_t *stid, idr_preload_end(); if (new_id < 0) return 0; + stid->cs_type = cs_type; return 1; } @@ -1019,7 +1019,8 @@ void nfs4_free_copy_state(struct nfsd4_copy *copy) { struct nfsd_net *nn; - WARN_ON_ONCE(copy->cp_stateid.cs_type != NFS4_COPY_STID); + if (copy->cp_stateid.cs_type != NFS4_COPY_STID) + return; nn = net_generic(copy->cp_clp->net, nfsd_net_id); spin_lock(&nn->s2s_cp_lock); idr_remove(&nn->s2s_cp_stateids,