smb3: fix problem with null cifs super block with previous patch

Add check for null cifs_sb to create_options helper
Signed-off-by: NSteve French <stfrench@microsoft.com>
Reviewed-by: NAmir Goldstein <amir73il@gmail.com>
Reviewed-by: NAurelien Aptel <aaptel@suse.com>

fs/cifs/cifsproto.h

@@ -614,7 +614,7 @@ static inline int get_dfs_path(const unsigned int xid, struct cifs_ses *ses,
 
 static inline int cifs_create_options(struct cifs_sb_info *cifs_sb, int options)
 {
-	if (backup_cred(cifs_sb))
+	if (cifs_sb && (backup_cred(cifs_sb)))
 		return options | CREATE_OPEN_BACKUP_INTENT;
 	else
 		return options;

fs/cifs/smb2ops.c

@@ -2407,7 +2407,7 @@ smb2_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
 				      FS_FULL_SIZE_INFORMATION,
 				      SMB2_O_INFO_FILESYSTEM,
 				      sizeof(struct smb2_fs_full_size_info),
-				      &rsp_iov, &buftype, NULL);
+				      &rsp_iov, &buftype, cifs_sb);
 	if (rc)
 		goto qfs_exit;