Date: Sat, 29 Jul 2017 02:25:49 +0000 (UTC) From: Rick Macklem <rmacklem@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r321675 - head/sys/fs/nfsclient Message-ID: <201707290225.v6T2Pnon002861@repo.freebsd.org>
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Author: rmacklem Date: Sat Jul 29 02:25:49 2017 New Revision: 321675 URL: https://svnweb.freebsd.org/changeset/base/321675 Log: Fix possible crash for the NFSv4.1 pNFS client. If the nfsrpc_createlayoutrpc() call in nfsrpc_getcreatelayout() fails, the code used nfhpp when it might be set NULL. This patch checks for the error cases (laystat != 0) and avoids using nfhpp for the failure case. This would only affect NFSv4.1 mounts with the "pnfs" option. Found while testing the "umount -N" patch not yet in head. MFC after: 2 weeks Modified: head/sys/fs/nfsclient/nfs_clrpcops.c Modified: head/sys/fs/nfsclient/nfs_clrpcops.c ============================================================================== --- head/sys/fs/nfsclient/nfs_clrpcops.c Fri Jul 28 23:56:07 2017 (r321674) +++ head/sys/fs/nfsclient/nfs_clrpcops.c Sat Jul 29 02:25:49 2017 (r321675) @@ -6643,9 +6643,14 @@ nfsrpc_getcreatelayout(vnode_t dvp, char *name, int na NFSCL_DEBUG(4, "aft nfsrpc_createlayoutrpc laystat=%d err=%d\n", laystat, error); lyp = NULL; - nfhp = *nfhpp; - laystat = nfsrpc_layoutgetres(nmp, dvp, nfhp->nfh_fh, nfhp->nfh_len, - &stateid, retonclose, NULL, &lyp, &flh, laystat, NULL, cred, p); + if (laystat == 0) { + nfhp = *nfhpp; + laystat = nfsrpc_layoutgetres(nmp, dvp, nfhp->nfh_fh, + nfhp->nfh_len, &stateid, retonclose, NULL, &lyp, &flh, + laystat, NULL, cred, p); + } else + laystat = nfsrpc_layoutgetres(nmp, dvp, NULL, 0, &stateid, + retonclose, NULL, &lyp, &flh, laystat, NULL, cred, p); if (laystat == 0) nfscl_rellayout(lyp, 0); return (error);
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