Merge tag '5.9-rc-smb3-fixes-part2' of git://git.samba.org/sfrench/cifs-2.6

Pull cifs fixes from Steve French:
 "Three small cifs/smb3 fixes, one for stable fixing mkdir path with
  the 'idsfromsid' mount option"

* tag '5.9-rc-smb3-fixes-part2' of git://git.samba.org/sfrench/cifs-2.6:
  SMB3: Fix mkdir when idsfromsid configured on mount
  cifs: Convert to use the fallthrough macro
  cifs: Fix an error pointer dereference in cifs_mount()

fs/cifs/connect.c

@@ -4886,6 +4886,7 @@ int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *vol)
 		full_path = build_unc_path_to_root(vol, cifs_sb, !!count);
 		if (IS_ERR(full_path)) {
 			rc = PTR_ERR(full_path);
+			full_path = NULL;
 			break;
 		}
 		/* Chase referral */

fs/cifs/smb2inode.c

@@ -115,6 +115,7 @@ smb2_compound_op(const unsigned int xid, struct cifs_tcon *tcon,
 	vars->oparms.fid = &fid;
 	vars->oparms.reconnect = false;
 	vars->oparms.mode = mode;
+	vars->oparms.cifs_sb = cifs_sb;
 
 	rqst[num_rqst].rq_iov = &vars->open_iov[0];
 	rqst[num_rqst].rq_nvec = SMB2_CREATE_IOV_SIZE;

fs/cifs/smb2pdu.c

@@ -3913,7 +3913,7 @@ smb2_readv_callback(struct mid_q_entry *mid)
 	case MID_RESPONSE_MALFORMED:
 		credits.value = le16_to_cpu(shdr->CreditRequest);
 		credits.instance = server->reconnect_instance;
-		/* fall through */
+		fallthrough;
 	default:
 		rdata->result = -EIO;
 	}
@@ -4146,7 +4146,7 @@ smb2_writev_callback(struct mid_q_entry *mid)
 	case MID_RESPONSE_MALFORMED:
 		credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
 		credits.instance = server->reconnect_instance;
-		/* fall through */
+		fallthrough;
 	default:
 		wdata->result = -EIO;
 		break;