From owner-svn-src-all@freebsd.org Mon Jul 30 12:10:25 2018 Return-Path: Delivered-To: svn-src-all@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 0606210551D2; Mon, 30 Jul 2018 12:10:25 +0000 (UTC) (envelope-from rmacklem@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 9FD2E96B0F; Mon, 30 Jul 2018 12:10:24 +0000 (UTC) (envelope-from rmacklem@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 6351824180; Mon, 30 Jul 2018 12:10:24 +0000 (UTC) (envelope-from rmacklem@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id w6UCAOK1006328; Mon, 30 Jul 2018 12:10:24 GMT (envelope-from rmacklem@FreeBSD.org) Received: (from rmacklem@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id w6UCAODb006327; Mon, 30 Jul 2018 12:10:24 GMT (envelope-from rmacklem@FreeBSD.org) Message-Id: <201807301210.w6UCAODb006327@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: rmacklem set sender to rmacklem@FreeBSD.org using -f From: Rick Macklem Date: Mon, 30 Jul 2018 12:10:24 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org Subject: svn commit: r336898 - in stable/11/sys/fs: nfs nfsclient X-SVN-Group: stable-11 X-SVN-Commit-Author: rmacklem X-SVN-Commit-Paths: in stable/11/sys/fs: nfs nfsclient X-SVN-Commit-Revision: 336898 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.27 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 30 Jul 2018 12:10:25 -0000 Author: rmacklem Date: Mon Jul 30 12:10:23 2018 New Revision: 336898 URL: https://svnweb.freebsd.org/changeset/base/336898 Log: MFC: r334966 Add a couple of safety belt checks to the NFSv4.1 client related to sessions. There were a couple of cases in newnfs_request() that it assumed that it was an NFSv4.1 mount with a session. This should always be the case when a Sequence operation is in the reply or the server replies NFSERR_BADSESSION. However, if a server was broken and sent an erroneous reply, these safety belt checks should avoid trouble. The one check required a small tweak to nfsmnt_mdssession() so that it returns NULL when there is no session instead of the offset of the field in the structure (0x8 for i386). This patch should have no effect on normal operation of the client. Found by inspection during pNFS server development. Modified: stable/11/sys/fs/nfs/nfs_commonkrpc.c stable/11/sys/fs/nfsclient/nfsmount.h Directory Properties: stable/11/ (props changed) Modified: stable/11/sys/fs/nfs/nfs_commonkrpc.c ============================================================================== --- stable/11/sys/fs/nfs/nfs_commonkrpc.c Mon Jul 30 11:41:51 2018 (r336897) +++ stable/11/sys/fs/nfs/nfs_commonkrpc.c Mon Jul 30 12:10:23 2018 (r336898) @@ -849,9 +849,9 @@ tryagain: if ((nmp != NULL && i == NFSV4OP_SEQUENCE && j != 0) || (clp != NULL && i == NFSV4OP_CBSEQUENCE && j != 0)) NFSCL_DEBUG(1, "failed seq=%d\n", j); - if ((nmp != NULL && i == NFSV4OP_SEQUENCE && j == 0) || - (clp != NULL && i == NFSV4OP_CBSEQUENCE && j == 0) - ) { + if (((nmp != NULL && i == NFSV4OP_SEQUENCE && j == 0) || + (clp != NULL && i == NFSV4OP_CBSEQUENCE && + j == 0)) && sep != NULL) { if (i == NFSV4OP_SEQUENCE) NFSM_DISSECT(tl, uint32_t *, NFSX_V4SESSIONID + @@ -893,7 +893,8 @@ tryagain: } if (nd->nd_repstat != 0) { if (nd->nd_repstat == NFSERR_BADSESSION && - nmp != NULL && dssep == NULL) { + nmp != NULL && dssep == NULL && + (nd->nd_flag & ND_NFSV41) != 0) { /* * If this is a client side MDS RPC, mark * the MDS session defunct and initiate Modified: stable/11/sys/fs/nfsclient/nfsmount.h ============================================================================== --- stable/11/sys/fs/nfsclient/nfsmount.h Mon Jul 30 11:41:51 2018 (r336897) +++ stable/11/sys/fs/nfsclient/nfsmount.h Mon Jul 30 12:10:23 2018 (r336898) @@ -127,8 +127,10 @@ nfsmnt_mdssession(struct nfsmount *nmp) { struct nfsclsession *tsep; + tsep = NULL; mtx_lock(&nmp->nm_mtx); - tsep = NFSMNT_MDSSESSION(nmp); + if (TAILQ_FIRST(&nmp->nm_sess) != NULL) + tsep = NFSMNT_MDSSESSION(nmp); mtx_unlock(&nmp->nm_mtx); return (tsep); }