nfsd4: ignore WANT bits in open downgrade

commit c30e92df30d7d5fe65262fbce5d1b7de675fe34e upstream.

We don't use WANT bits yet--and sending them can probably trigger a
BUG() further down.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 3d893645cc69eca8abe77b8b19d0044d43488115..ecd8152965eefc70973a24e4f5035a9cef3f7072 100644 (file)
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -3421,6 +3421,8 @@ nfsd4_open_downgrade(struct svc_rqst *rqstp,
        if (!access_valid(od->od_share_access, cstate->minorversion)
                        || !deny_valid(od->od_share_deny))
                return nfserr_inval;
+       /* We don't yet support WANT bits: */
+       od->od_share_access &= NFS4_SHARE_ACCESS_MASK;
 
        nfs4_lock_state();
        if ((status = nfs4_preprocess_seqid_op(cstate,