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MDEV-16699 heap-use-after-free in group_concat with compressed or GIS columns

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Field_blob::store() has special code for GROUP_CONCAT temporary table
(to store blob values in Blob_mem_storage - this prevents them
from being freed/overwritten when a next row is read).

Field_geom and Field_blob_compressed inherit from Field_blob but they
have their own ::store() method without this special Blob_mem_storage
support.

Considering that non-grouping CONCAT() of such fields converts
them to plain BLOB, let's do the same for GROUP_CONCAT. To do it,
Item_func_group_concat::setup will signal that it's creating
a temporary table for GROUP_CONCAT, and Field_blog::make_new_field()
override will create base Field_blob when under group concat.
This commit is contained in:
Sergei Golubchik
2024-08-31 23:57:33 +02:00
parent 65418ca9ad
commit 3ea71a2c8e
11 changed files with 89 additions and 26 deletions
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12
mysql-test/main/gis.test
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@ -3445,5 +3445,15 @@ SELECT AsText(g) FROM t1;
DROP TABLE t1;
--echo #
--echo # End of 10.5 tests
--echo # MDEV-16699 heap-use-after-free in group_concat with compressed or GIS columns
--echo #
create table t1 (c polygon);
insert into t1 values
(PolygonFromText('POLYGON((1 2,1 2))')),
(PolygonFromText('POLYGON((0 0,1 1,0 0))'));
select length(group_concat(c, c order by 1,2)) from t1;
create table t2 as select group_concat(c, c order by 1,2), concat(c), c from t1;
show create table t2;
drop table t1, t2;
--echo # End of 10.5 tests