From ff91c62e28b4c2511e0f2f19fe3c6b726f6b1600 Mon Sep 17 00:00:00 2001 From: rmacklem Date: Fri, 23 Dec 2011 02:04:35 +0000 Subject: [PATCH] During investigation of an NFSv4 client crash reported by glebius@, jhb@ spotted that nfscl_getstateid() might modify credentials when called from nfsrpc_read() for the case where p != NULL, whereas nfsrpc_read() only did a crdup() to get new credentials for p == NULL. This bug was introduced by r195510, since pre-r195510 nfscl_getstateid() only modified credentials for the p == NULL case. This patch modifies nfsrpc_read()/nfsrpc_write() so that they do crdup() for the p != NULL case. It is conceivable that this bug caused the crash reported by glebius@, but that will not be determined for some time, since the crash occurred after about 1month of operation. Tested by: glebius Reviewed by: jhb MFC after: 2 weeks --- sys/fs/nfsclient/nfs_clrpcops.c | 10 ++++------ 1 file changed, 4 insertions(+), 6 deletions(-) diff --git a/sys/fs/nfsclient/nfs_clrpcops.c b/sys/fs/nfsclient/nfs_clrpcops.c index 4fa5460ce47d..05ff2ec5bb88 100644 --- a/sys/fs/nfsclient/nfs_clrpcops.c +++ b/sys/fs/nfsclient/nfs_clrpcops.c @@ -1232,8 +1232,7 @@ nfsrpc_read(vnode_t vp, struct uio *uiop, struct ucred *cred, newcred = cred; if (NFSHASNFSV4(nmp)) { nfhp = np->n_fhp; - if (p == NULL) - newcred = NFSNEWCRED(cred); + newcred = NFSNEWCRED(cred); } retrycnt = 0; do { @@ -1263,7 +1262,7 @@ nfsrpc_read(vnode_t vp, struct uio *uiop, struct ucred *cred, expireret == 0 && clidrev != 0 && retrycnt < 4)); if (error && retrycnt >= 4) error = EIO; - if (NFSHASNFSV4(nmp) && p == NULL) + if (NFSHASNFSV4(nmp)) NFSFREECRED(newcred); return (error); } @@ -1384,8 +1383,7 @@ nfsrpc_write(vnode_t vp, struct uio *uiop, int *iomode, int *must_commit, clidrev = nmp->nm_clp->nfsc_clientidrev; newcred = cred; if (NFSHASNFSV4(nmp)) { - if (p == NULL) - newcred = NFSNEWCRED(cred); + newcred = NFSNEWCRED(cred); nfhp = np->n_fhp; } retrycnt = 0; @@ -1435,7 +1433,7 @@ nfsrpc_write(vnode_t vp, struct uio *uiop, int *iomode, int *must_commit, ((error == NFSERR_STALESTATEID || error == NFSERR_STALEDONTRECOVER) && called_from_strategy != 0))) error = EIO; - if (NFSHASNFSV4(nmp) && p == NULL) + if (NFSHASNFSV4(nmp)) NFSFREECRED(newcred); return (error); }