[PATCH v2 21/28] nfsd: allow nfsd4_encode_fattr4_change() to work with no export

[Jeff Layton]

In the context of a CB_NOTIFY callback, we may not have easy access to
a svc_export. nfsd will not currently grant a delegation on a the V4 root
however, so this should be safe.

Signed-off-by: Jeff Layton <jlay...@kernel.org>
---
 fs/nfsd/nfs4xdr.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index b9b173ec7421..91681aea9d7f 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -3257,7 +3257,7 @@ static __be32 nfsd4_encode_fattr4_change(struct 
xdr_stream *xdr,
 {
        const struct svc_export *exp = args->exp;
 
-       if (unlikely(exp->ex_flags & NFSEXP_V4ROOT)) {
+       if (exp && unlikely(exp->ex_flags & NFSEXP_V4ROOT)) {
                u32 flush_time = convert_to_wallclock(exp->cd->flush_time);
 
                if (xdr_stream_encode_u32(xdr, flush_time) != XDR_UNIT)

-- 
2.53.0