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MDEV-24935: Server crashes in Field_iterator_natural_join::next or Field_iterator_table_ref::set_field_iterator upon 2nd execution of SP

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Calling a stored routine that executes a join on three or more tables
and referencing not-existent column name in the USING clause resulted in
a crash on its second invocation.

Server crash taken place by the reason of dereferencing null pointer
in condition of DBUG_ASSERT inside the method
Field_iterator_natural_join::next()
There the data member
  cur_column_ref->table_field->field
has the nullptr value that was reset at the end of first
execution of a stored routine when the standalone procedure
cleanup_items() called by the method sp_head::execute.
Later this data member is not re-initialized and never referenced
in any place except the DBUG_ASSERT on second and later invocations
of the stored routine.

To fix the issue, the assert's condition should be augmented by
a condition '|| !cur_column_ref->table_field' before dereferencing
cur_column_ref->table_field. Such extra checking is aligned with
conditions used by DBUG_ASSERT macros used by implementation of
the class Field_iterator_table_ref that aggregated the class
Field_iterator_natural_join.
This commit is contained in:
Dmitry Shulga
2025-01-21 12:26:51 +07:00
parent d261fa5c70
commit 73f415c955
3 changed files with 59 additions and 0 deletions
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27
mysql-test/main/sp-bugs.result
View File

@@ -363,3 +363,30 @@ ERROR HY000: Unknown thread id: 0
#
# End of 10.4 tests
#
#
# MDEV-24935: Server crashes in Field_iterator_natural_join::next or Field_iterator_table_ref::set_field_iterator upon 2nd execution of SP
#
CREATE TABLE t1 (a INT);
CREATE TABLE t2 (b INT, c INT);
CREATE TABLE t3 (d INT);
CREATE PROCEDURE sp() SELECT * FROM t1 JOIN t2 JOIN t3 USING (x);
CALL sp;
ERROR 42S22: Unknown column 'x' in 'from clause'
CALL sp;
ERROR 42S22: Unknown column 'x' in 'from clause'
# Clean up
DROP PROCEDURE sp;
DROP TABLE t1, t2, t3;
CREATE TABLE t1 (c1 INT,c2 INT);
CREATE TABLE t2 (c INT,c2 INT);
CREATE PROCEDURE p2 (OUT i INT,OUT o INT) READS SQL DATA DELETE a2,a3 FROM t1 AS a1 JOIN t2 AS a2 NATURAL JOIN t2 AS a3;
CALL p2 (@c,@a);
ERROR 23000: Column 'c2' in from clause is ambiguous
CALL p2 (@a,@c);
ERROR 23000: Column 'c2' in from clause is ambiguous
# Clean up
DROP PROCEDURE p2;
DROP TABLE t1, t2;
#
# End of 10.5 tests
#

31
mysql-test/main/sp-bugs.test
View File

@@ -386,3 +386,34 @@ KILL (('x' IN ( SELECT 1)) MOD 44);
--echo #
--echo # End of 10.4 tests
--echo #
--echo #
--echo # MDEV-24935: Server crashes in Field_iterator_natural_join::next or Field_iterator_table_ref::set_field_iterator upon 2nd execution of SP
--echo #
CREATE TABLE t1 (a INT);
CREATE TABLE t2 (b INT, c INT);
CREATE TABLE t3 (d INT);
CREATE PROCEDURE sp() SELECT * FROM t1 JOIN t2 JOIN t3 USING (x);
--error ER_BAD_FIELD_ERROR
CALL sp;
--error ER_BAD_FIELD_ERROR
CALL sp;
--echo # Clean up
DROP PROCEDURE sp;
DROP TABLE t1, t2, t3;
CREATE TABLE t1 (c1 INT,c2 INT);
CREATE TABLE t2 (c INT,c2 INT);
CREATE PROCEDURE p2 (OUT i INT,OUT o INT) READS SQL DATA DELETE a2,a3 FROM t1 AS a1 JOIN t2 AS a2 NATURAL JOIN t2 AS a3;
--error ER_NON_UNIQ_ERROR
CALL p2 (@c,@a);
--error ER_NON_UNIQ_ERROR
CALL p2 (@a,@c);
--echo # Clean up
DROP PROCEDURE p2;
DROP TABLE t1, t2;
--echo #
--echo # End of 10.5 tests
--echo #

1
sql/table.cc
View File

@@ -6948,6 +6948,7 @@ void Field_iterator_natural_join::next()
{
cur_column_ref= column_ref_it++;
DBUG_ASSERT(!cur_column_ref || ! cur_column_ref->table_field ||
!cur_column_ref->table_field->field ||
cur_column_ref->table_ref->table ==
cur_column_ref->table_field->field->table);
}