4.18-stable review patch. If anyone has any objections, please let me know.
------------------
From: Scott Mayhew <smayhew@xxxxxxxxxx>
commit 01310bb7c9c98752cc763b36532fab028e0f8f81 upstream.
Make sure we have a saved filehandle, otherwise we'll oops with a null
pointer dereference in nfs4_preprocess_stateid_op().
Signed-off-by: Scott Mayhew <smayhew@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: J. Bruce Fields <bfields@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/nfsd/nfs4proc.c | 3 +++
1 file changed, 3 insertions(+)
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -1048,6 +1048,9 @@ nfsd4_verify_copy(struct svc_rqst *rqstp
{
__be32 status;
+ if (!cstate->save_fh.fh_dentry)
+ return nfserr_nofilehandle;
+
status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->save_fh,
src_stateid, RD_STATE, src, NULL);
if (status) {
