[PATCH v6 13/20] nfsd: allow nfsd4_encode_fattr4_change() to work with no export

[Jeff Layton <jlayton@kernel.org>]

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 <jlayton@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 7d162e5fb6ec..18adab1d7ca2 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -3273,7 +3273,7 @@ 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)

-- 
2.54.0