Bug#54543: update ignore with incorrect subquery leads to assertion failure:

inited==INDEX

When an error occurs while sending the data in a temporary table there was no
cleanup performed. This caused a failed assertion in the case when different
access methods were used for populating the table vs. retrieving the data from
the table if IGNORE was specified and sql_safe_updates = 0. In this case
execution continues, but the handler expects to continue with the access
method used for row retrieval.

Fixed by doing the cleanup even if errors occur.

mysql-test/r/multi_update.result

@@ -639,4 +639,24 @@ SET SESSION sql_safe_updates = 1;
 UPDATE IGNORE t1, t1 t1a SET t1.a = 1 WHERE t1a.a = 1;
 ERROR HY000: You are using safe update mode and you tried to update a table without a WHERE that uses a KEY column
 DROP TABLE t1;
+#
+# Bug#54543: update ignore with incorrect subquery leads to assertion
+# failure: inited==INDEX
+#
+SET SESSION sql_safe_updates = 0;
+CREATE TABLE t1 ( a INT );
+INSERT INTO t1 VALUES (1), (2);
+CREATE TABLE t2 ( a INT );
+INSERT INTO t2 VALUES (1), (2);
+CREATE TABLE t3 ( a INT );
+INSERT INTO t3 VALUES (1), (2);
+# Should not crash
+UPDATE IGNORE
+( SELECT ( SELECT COUNT(*) FROM t1 GROUP BY a, @v ) a FROM t2 ) x, t3
+SET t3.a = 0;
+Warnings:
+Error	1242	Subquery returns more than 1 row
+Error	1242	Subquery returns more than 1 row
+DROP TABLE t1, t2, t3;
+SET SESSION sql_safe_updates = DEFAULT;
 end of tests

mysql-test/t/multi_update.test

@@ -651,5 +651,26 @@ SET SESSION sql_safe_updates = 1;
 UPDATE IGNORE t1, t1 t1a SET t1.a = 1 WHERE t1a.a = 1;
 DROP TABLE t1;
 
+--echo #
+--echo # Bug#54543: update ignore with incorrect subquery leads to assertion
+--echo # failure: inited==INDEX
+--echo #
+SET SESSION sql_safe_updates = 0;
+CREATE TABLE t1 ( a INT );
+INSERT INTO t1 VALUES (1), (2);
+
+CREATE TABLE t2 ( a INT );
+INSERT INTO t2 VALUES (1), (2);
+
+CREATE TABLE t3 ( a INT );
+INSERT INTO t3 VALUES (1), (2);
+
+--echo # Should not crash
+UPDATE IGNORE
+  ( SELECT ( SELECT COUNT(*) FROM t1 GROUP BY a, @v ) a FROM t2 ) x, t3
+SET t3.a = 0;
+
+DROP TABLE t1, t2, t3;
+SET SESSION sql_safe_updates = DEFAULT;
 
 --echo end of tests

sql/sql_select.cc

@@ -11157,22 +11157,20 @@ do_select(JOIN *join,List<Item> *fields,TABLE *table,Procedure *procedure)
   if (error == NESTED_LOOP_NO_MORE_ROWS)
     error= NESTED_LOOP_OK;
 
+  if (table == NULL)					// If sending data to client
+    /*
+      The following will unlock all cursors if the command wasn't an
+      update command
+    */
+    join->join_free();			// Unlock all cursors
   if (error == NESTED_LOOP_OK)
   {
     /*
       Sic: this branch works even if rc != 0, e.g. when
       send_data above returns an error.
     */
-    if (!table)					// If sending data to client
-    {
-      /*
-	The following will unlock all cursors if the command wasn't an
-	update command
-      */
-      join->join_free();			// Unlock all cursors
-      if (join->result->send_eof())
-	rc= 1;                                  // Don't send error
-    }
+    if (table == NULL && join->result->send_eof()) // If sending data to client
+      rc= 1;                                  // Don't send error 
     DBUG_PRINT("info",("%ld records output", (long) join->send_records));
   }
   else