Patch "nfsd: Detect unhashed stids in nfsd4_verify_open_stid()" has been added to the 4.15-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    nfsd: Detect unhashed stids in nfsd4_verify_open_stid()

to the 4.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     nfsd-detect-unhashed-stids-in-nfsd4_verify_open_stid.patch
and it can be found in the queue-4.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 4f1764172a0aa7395d12b96cae640ca1438c5085 Mon Sep 17 00:00:00 2001
From: Trond Myklebust <trond.myklebust@primarydata.com>
Date: Fri, 12 Jan 2018 17:42:30 -0500
Subject: nfsd: Detect unhashed stids in nfsd4_verify_open_stid()

From: Trond Myklebust <trond.myklebust@primarydata.com>

commit 4f1764172a0aa7395d12b96cae640ca1438c5085 upstream.

The state of the stid is guaranteed by 2 locks:
- The nfs4_client 'cl_lock' spinlock
- The nfs4_ol_stateid 'st_mutex' mutex

so it is quite possible for the stid to be unhashed after lookup,
but before calling nfsd4_lock_ol_stateid(). So we do need to check
for a zero value for 'sc_type' in nfsd4_verify_open_stid().

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Tested-by: Checuk Lever <chuck.lever@oracle.com>
Fixes: 659aefb68eca "nfsd: Ensure we don't recognise lock stateids..."
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 fs/nfsd/nfs4state.c |    1 +
 1 file changed, 1 insertion(+)

--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -3590,6 +3590,7 @@ nfsd4_verify_open_stid(struct nfs4_stid
 	switch (s->sc_type) {
 	default:
 		break;
+	case 0:
 	case NFS4_CLOSED_STID:
 	case NFS4_CLOSED_DELEG_STID:
 		ret = nfserr_bad_stateid;


Patches currently in stable-queue which might be from trond.myklebust@primarydata.com are

queue-4.15/nfs-pnfs-fix-nfs_direct_req-ref-leak-when-i-o-falls-back-to-the-mds.patch
queue-4.15/nfsd-detect-unhashed-stids-in-nfsd4_verify_open_stid.patch
queue-4.15/nfs-fix-nfsstat-breakage-due-to-lookupp.patch
queue-4.15/nfs-add-a-cond_resched-to-nfs_commit_release_pages.patch
queue-4.15/nfs41-do-not-return-enomem-on-layoutunavailable.patch
queue-4.15/nfs-commit-direct-writes-even-if-they-fail-partially.patch
queue-4.15/nfs-fix-a-race-between-mmap-and-o_direct.patch