[PATCH] nfsd: COPY and CLONE operations require the saved filehandle to be set

Scott Mayhew
2018-11-08T16:11:37Z

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@redhat.com>
---
fs/nfsd/nfs4proc.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index edff074d38c7..d505990dac7c 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -1038,6 +1038,9 @@ nfsd4_verify_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
{
__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) {
--
2.17.1