MDEV-29972 Crash emitting "Unsupported meta-data version number" error message

row_import_read_meta_data(): Use ER_NOT_SUPPORTED_YET instead of
ER_IO_READ_ERROR to have a matching error message pattern.

mysql-test/suite/innodb/r/innodb-wl5522-1.result

@@ -808,6 +808,18 @@ call mtr.add_suppression("InnoDB: unsupported MySQL tablespace");
 ALTER TABLE t1 IMPORT TABLESPACE;
 ERROR 42000: Table 't1' uses an extension that doesn't exist in this MariaDB version
 DROP TABLE t1;
-#
 # End of 10.3 tests
 #
+# MDEV-29972 crash after "Unsupported meta-data version number"
+#
+call mtr.add_suppression("Index for table 't2' is corrupt");
+CREATE TABLE t2 (i INT PRIMARY KEY) ENGINE=InnoDB;
+ALTER TABLE t2 DISCARD TABLESPACE;
+ALTER TABLE t2 IMPORT TABLESPACE;
+ERROR 42000: This version of MariaDB doesn't yet support 'meta-data version'
+ALTER TABLE t2 IMPORT TABLESPACE;
+ERROR HY000: Index for table 't2' is corrupt; try to repair it
+SELECT * FROM t2;
+ERROR HY000: Tablespace has been discarded for table `t2`
+DROP TABLE t2;
+# End of 10.4 tests

mysql-test/suite/innodb/t/innodb-wl5522-1.test

@@ -960,6 +960,25 @@ ALTER TABLE t1 IMPORT TABLESPACE;
 DROP TABLE t1;
 --remove_file $MYSQLTEST_VARDIR/tmp/t1.ibd
 
---echo #
 --echo # End of 10.3 tests
+
 --echo #
+--echo # MDEV-29972 crash after "Unsupported meta-data version number"
+--echo #
+
+call mtr.add_suppression("Index for table 't2' is corrupt");
+
+CREATE TABLE t2 (i INT PRIMARY KEY) ENGINE=InnoDB;
+ALTER TABLE t2 DISCARD TABLESPACE;
+--copy_file std_data/mysql80/t2.cfg $MYSQLD_DATADIR/test/t2.cfg
+--copy_file std_data/mysql80/t2.ibd $MYSQLD_DATADIR/test/t2.ibd
+--error ER_NOT_SUPPORTED_YET
+ALTER TABLE t2 IMPORT TABLESPACE;
+--remove_file $MYSQLD_DATADIR/test/t2.cfg
+--error ER_NOT_KEYFILE
+ALTER TABLE t2 IMPORT TABLESPACE;
+--error ER_TABLESPACE_DISCARDED
+SELECT * FROM t2;
+DROP TABLE t2;
+
+--echo # End of 10.4 tests

storage/innobase/row/row0import.cc

@@ -120,7 +120,6 @@ struct row_import {
 	row_import() UNIV_NOTHROW
 		:
 		m_table(NULL),
-		m_version(0),
 		m_hostname(NULL),
 		m_table_name(NULL),
 		m_autoinc(0),
@@ -199,8 +198,6 @@ struct row_import {
 
 	dict_table_t*	m_table;		/*!< Table instance */
 
-	ulint		m_version;		/*!< Version of config file */
-
 	byte*		m_hostname;		/*!< Hostname where the
 						tablespace was exported */
 	byte*		m_table_name;		/*!< Exporting instance table
@@ -3090,17 +3087,13 @@ row_import_read_meta_data(
 		return(DB_IO_ERROR);
 	}
 
-	cfg.m_version = mach_read_from_4(row);
-
 	/* Check the version number. */
-	switch (cfg.m_version) {
+	switch (mach_read_from_4(row)) {
 	case IB_EXPORT_CFG_VERSION_V1:
-
 		return(row_import_read_v1(file, thd, &cfg));
 	default:
-		ib_errf(thd, IB_LOG_LEVEL_ERROR, ER_IO_READ_ERROR,
-			"Unsupported meta-data version number (" ULINTPF "), "
-			"file ignored", cfg.m_version);
+		ib_senderrf(thd, IB_LOG_LEVEL_ERROR, ER_NOT_SUPPORTED_YET,
+			    "meta-data version");
 	}
 
 	return(DB_ERROR);