Bug#46374 crash, INSERT INTO t1 uses function, function modifies t1

An error occuring in the execution of a stored procedure, called
from do_select is masked, since the error condition is not
propagated back to the caller (join->conds->val_int() returns
a result value, and not an error code)
                  
An explicit check was added to see if the thd error code has been
set, and if so, the loop status is set to the error state.

Backport from 6.0-codebase (revid: 2617.68.31)

mysql-test/t/sp-error.test

@@ -2490,6 +2490,35 @@ SELECT AVG (a) FROM t1 WHERE b = 999999;
 SELECT non_existent (a) FROM t1 WHERE b = 999999;
 DROP TABLE t1;
 
+
+#
+# Bug #46374 crash, INSERT INTO t1 uses function, function modifies t1
+#
+CREATE TABLE t1 ( f2 INTEGER, f3 INTEGER );
+INSERT INTO t1 VALUES  ( 1, 1 );
+
+delimiter |;
+
+CREATE FUNCTION func_1 () RETURNS INTEGER
+BEGIN
+  INSERT INTO t1 SELECT * FROM t1 ;
+  RETURN 1 ;
+END|
+
+delimiter ;|
+
+# The bug caused the following INSERT statement to trigger
+# an assertion.   Error 1442 is the correct response
+#
+--error 1442
+INSERT INTO t1 SELECT * FROM (SELECT 2 AS f1, 2 AS f2) AS A WHERE func_1() = 5;
+
+# Cleanup
+DROP FUNCTION func_1;
+DROP TABLE t1;
+
+
+
 --echo #
 --echo # Bug #47788: Crash in TABLE_LIST::hide_view_error on UPDATE + VIEW + 
 --echo #   SP + MERGE + ALTER
@@ -2513,3 +2542,4 @@ DROP VIEW v1;
 DROP TABLE t1;
 
 --echo End of 5.1 tests
+