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| author | Karthik Kamath <karthik.kamath@oracle.com> | 2020-08-31 12:21:07 +0530 |
|---|---|---|
| committer | Sergei Golubchik <serg@mariadb.org> | 2020-10-27 09:24:15 +0100 |
| commit | 1269fd420dbcac2cedb345944a35aebe3562ddc1 (patch) | |
| tree | 361b1b508c4f53dcce700e5b79a1221e43e74871 | |
| parent | 0c3723e1d50e61303b63f6264c2c193397ee4475 (diff) | |
| download | mariadb-git-1269fd420dbcac2cedb345944a35aebe3562ddc1.tar.gz | |
BUG#31650096: MYSQL SERVER HEAP-USE-AFTER-FREE IN TRANS_SAVEPOINT
ANALYSIS:
=========
During Bootstrap, while executing the statements from sql
file passed to the init-file server option, transaction
mem_root was being freed for every statement. This creates
an issue with multi statement transactions especially when a
statement in the transaction has to access the memory used
by the previous statement in the transaction.
FIX:
====
Transaction mem_root is freed whenever a transaction is
committed or rolled-back. Hence explicitly freeing it is not
necessary in the bootstrap implementation.
Change-Id: I40f71d49781bf7ad32d474bb176bd6060c9377dc
| -rw-r--r-- | sql/sql_parse.cc | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/sql/sql_parse.cc b/sql/sql_parse.cc index bf1dad804e3..64b9f35d664 100644 --- a/sql/sql_parse.cc +++ b/sql/sql_parse.cc @@ -811,7 +811,6 @@ static void handle_bootstrap_impl(THD *thd) thd->reset_kill_query(); /* Ensure that killed_errmsg is released */ free_root(thd->mem_root,MYF(MY_KEEP_PREALLOC)); - free_root(&thd->transaction.mem_root,MYF(MY_KEEP_PREALLOC)); thd->lex->restore_set_statement_var(); } |