cifs: Check the lease context if we actually got a lease

Some servers may return that we got a lease in rsp->OplockLevel
but then in the lease context contradict this and say we got no lease
at all.  Thus we need to check the context if we have a lease.
Additionally, If we do not get a lease we need to make sure we close
the handle before we return an error to the caller.

Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Cc: stable@vger.kernel.org
Reviewed-by: Bharath SM <bharathsm@microsoft.com>
Reviewed-by: Paulo Alcantara (SUSE) <pc@manguebit.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

fs/cifs/cached_dir.c

@@ -221,8 +221,7 @@ int open_cached_dir(unsigned int xid, struct cifs_tcon *tcon,
 		}
 		goto oshr_free;
 	}
-
-	atomic_inc(&tcon->num_remote_opens);
+	cfid->is_open = true;
 
 	o_rsp = (struct smb2_create_rsp *)rsp_iov[0].iov_base;
 	oparms.fid->persistent_fid = o_rsp->PersistentFileId;
@@ -239,7 +238,8 @@ int open_cached_dir(unsigned int xid, struct cifs_tcon *tcon,
 			    &oparms.fid->epoch,
 			    oparms.fid->lease_key, &oplock,
 			    NULL, NULL);
-
+	if (!(oplock & SMB2_LEASE_READ_CACHING_HE))
+		goto oshr_free;
 	qi_rsp = (struct smb2_query_info_rsp *)rsp_iov[1].iov_base;
 	if (le32_to_cpu(qi_rsp->OutputBufferLength) < sizeof(struct smb2_file_all_info))
 		goto oshr_free;
@@ -262,7 +262,6 @@ int open_cached_dir(unsigned int xid, struct cifs_tcon *tcon,
 	cfid->dentry = dentry;
 	cfid->tcon = tcon;
 	cfid->time = jiffies;
-	cfid->is_open = true;
 	cfid->has_lease = true;
 
 oshr_free:
@@ -282,12 +281,17 @@ int open_cached_dir(unsigned int xid, struct cifs_tcon *tcon,
 	}
 	spin_unlock(&cfids->cfid_list_lock);
 	if (rc) {
+		if (cfid->is_open)
+			SMB2_close(0, cfid->tcon, cfid->fid.persistent_fid,
+				   cfid->fid.volatile_fid);
 		free_cached_dir(cfid);
 		cfid = NULL;
 	}
 
-	if (rc == 0)
+	if (rc == 0) {
 		*ret_cfid = cfid;
+		atomic_inc(&tcon->num_remote_opens);
+	}
 
 	return rc;
 }