git: c91861cc216d - stable/14 - nfscl: Do not use nfso_own for delayed nfsrpc_doclose()
- Go to: [ bottom of page ] [ top of archives ] [ this month ]
Date: Wed, 01 May 2024 01:06:13 UTC
The branch stable/14 has been updated by rmacklem: URL: https://cgit.FreeBSD.org/src/commit/?id=c91861cc216d5fdd4824eaace53d08c372f6cf73 commit c91861cc216d5fdd4824eaace53d08c372f6cf73 Author: Rick Macklem <rmacklem@FreeBSD.org> AuthorDate: 2024-04-26 03:58:21 +0000 Commit: Rick Macklem <rmacklem@FreeBSD.org> CommitDate: 2024-05-01 01:04:52 +0000 nfscl: Do not use nfso_own for delayed nfsrpc_doclose() When an initial attempt to close an NFSv4 lock returns NFSERR_DELAY, the open structure is put on a list for delayed closing. When this is done, the nfso_own field is set to NULL, so it cannot be used by nfsrpc_doclose(). Without this patch, the NFSv4 client can crash when a NFSv4 server replies NFSERR_DELAY to a Close operation. Fortunately, most extant NFSv4 servers do not do this. This patch avoids the crash for any that do return NFSERR_DELAY for Close. Found during a IETF bakeathon testing event this week. (cherry picked from commit 6251027c4252edb3b8f8fc359a40e610349e9af3) --- sys/fs/nfsclient/nfs_clrpcops.c | 20 ++++++++++++++------ 1 file changed, 14 insertions(+), 6 deletions(-) diff --git a/sys/fs/nfsclient/nfs_clrpcops.c b/sys/fs/nfsclient/nfs_clrpcops.c index 75bb5236cb65..8c5532268287 100644 --- a/sys/fs/nfsclient/nfs_clrpcops.c +++ b/sys/fs/nfsclient/nfs_clrpcops.c @@ -826,6 +826,7 @@ nfsrpc_doclose(struct nfsmount *nmp, struct nfsclopen *op, NFSPROC_T *p, u_int64_t off = 0, len = 0; u_int32_t type = NFSV4LOCKT_READ; int error, do_unlock, trycnt; + bool own_not_null; tcred = newnfs_getcred(); newnfs_copycred(&op->nfso_cred, tcred); @@ -892,22 +893,29 @@ nfsrpc_doclose(struct nfsmount *nmp, struct nfsclopen *op, NFSPROC_T *p, * There could be other Opens for different files on the same * OpenOwner, so locking is required. */ - NFSLOCKCLSTATE(); - nfscl_lockexcl(&op->nfso_own->nfsow_rwlock, NFSCLSTATEMUTEXPTR); - NFSUNLOCKCLSTATE(); + own_not_null = false; + if (op->nfso_own != NULL) { + own_not_null = true; + NFSLOCKCLSTATE(); + nfscl_lockexcl(&op->nfso_own->nfsow_rwlock, NFSCLSTATEMUTEXPTR); + NFSUNLOCKCLSTATE(); + } do { error = nfscl_tryclose(op, tcred, nmp, p, loop_on_delayed); if (error == NFSERR_GRACE) (void) nfs_catnap(PZERO, error, "nfs_close"); } while (error == NFSERR_GRACE); - NFSLOCKCLSTATE(); - nfscl_lockunlock(&op->nfso_own->nfsow_rwlock); + if (own_not_null) { + NFSLOCKCLSTATE(); + nfscl_lockunlock(&op->nfso_own->nfsow_rwlock); + } LIST_FOREACH_SAFE(lp, &op->nfso_lock, nfsl_list, nlp) nfscl_freelockowner(lp, 0); if (freeop && error != NFSERR_DELAY) nfscl_freeopen(op, 0, true); - NFSUNLOCKCLSTATE(); + if (own_not_null) + NFSUNLOCKCLSTATE(); NFSFREECRED(tcred); return (error); }