6e9e48648a
Execution of UPDATE statement on a table that has an associated trigger and the UPDATE statement tries to modify a column having the DEFAULT clause, could result in either assert firing or incorrect issuing of the ER_BAD_NULL_ERROR error. The reason of such behaviour is that on opening of a table that has an associated trigger, the method Table_triggers_list::prepare_record_accessors called to prepare Field objects referencing TABLE::record[1] instead of record[0]. This method allocates a new array of Field objects as copies of original table fields but updated null_ptr data members pointing to an array of extra_null_bitmap allocated before that on table's mem_root. Later switch_to_nullable_trigger_fields() is called where table' fields is switched to the new array allocated at Table_triggers_list::prepare_record_accessors(). After that, when fill_record() is invoked to fill table fields with values, so the make_default_field is invoked to handle the clause DEFAULT and the function make_default_field() called to create a field object. The function make_default_field() creates a copy of Field object and updates its data member prt/null_tr to position their to right place of table's record buffer, but since the method Table_triggers_list::prepare_record_accessors has been invoked before, the expression def_field->table->s->default_values - def_field->table->record[0] used for pointers adjustment leads to pointing to arbitrary memory not associated with the table. To fix the issue, use the TABLE_SHARE fields for referencing to columns default values. |
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| libmariadb@b5a2c9f3c2 | ||
| libmysqld | ||
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| CONTRIBUTING.md | ||
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| README.md | ||
| SECURITY.md | ||
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Code status:
ci.appveyor.com
MariaDB: The innovative open source database
MariaDB was designed as a drop-in replacement of MySQL(R) with more features, new storage engines, fewer bugs, and better performance.
MariaDB is brought to you by the MariaDB Foundation and the MariaDB Corporation. Please read the CREDITS file for details about the MariaDB Foundation, and who is developing MariaDB.
MariaDB is developed by many of the original developers of MySQL who now work for the MariaDB Corporation, the MariaDB Foundation and by many people in the community.
MySQL, which is the base of MariaDB, is a product and trademark of Oracle Corporation, Inc. For a list of developers and other contributors, see the Credits appendix. You can also run 'SHOW authors' to get a list of active contributors.
A description of the MariaDB project and a manual can be found at:
https://mariadb.com/kb/en/mariadb-vs-mysql-features/
https://mariadb.com/kb/en/mariadb-versus-mysql-compatibility/
https://mariadb.com/kb/en/new-and-old-releases/
Getting the code, building it and testing it
Refer to the following guide: https://mariadb.org/get-involved/getting-started-for-developers/get-code-build-test/ which outlines how to build the source code correctly and run the MariaDB testing framework, as well as which branch to target for your contributions.
Help
More help is available from the Maria Discuss mailing list https://lists.mariadb.org/postorius/lists/discuss.lists.mariadb.org/ and MariaDB's Zulip instance, https://mariadb.zulipchat.com/
Licensing
MariaDB is specifically available only under version 2 of the GNU General Public License (GPLv2). (I.e. Without the "any later version" clause.) This is inherited from MySQL. Please see the README file in the MySQL distribution for more information.
License information can be found in the COPYING file. Third party license information can be found in the THIRDPARTY file.
Bug Reports
Bug and/or error reports regarding MariaDB should be submitted at: https://jira.mariadb.org
For reporting security vulnerabilities, see our security-policy.
The code for MariaDB, including all revision history, can be found at: https://github.com/MariaDB/server