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CVE-2021-46665: [MDEV-25636] Bug report: abortion in sql/sql_parse.cc:6294

MariaDB through 10.5.9 allows a sql_parse.cc application crash because of incorrect used_tables expectations.

CVE
#sql

I used my fuzzing tool to test Mariadb , and found a bug that can result in an abortion. This bug looks similar to MDEV-25634, but is call stack is different from MDEV-25634. Please check whether it is the repeated one.

Mariadb installation:

  1. cd mariadb-10.5.9
  2. mkdir build; cd build
  3. cmake -DWITH_ASAN=ON -DWITH_ASAN_SCOPE=ON -DWITH_DEBUG=ON …/
  4. make -j8 && sudo make install

How to Repeat:
export ASAN_OPTIONS=detect_leaks=0
/usr/local/mysql/bin/mysqld_safe &
/usr/local/mysql/bin/mysql -uroot -p123456(your password)
MariaDB> drop database if exists test_db;
MariaDB> create database test_db;
MariaDB> source fuzz.sql;

I have simplified the content of fuzz.sql, and I hope fuzz.sql can help you reproduce the bug and fix it. In addition, I attach the abortion report (which has its stack trace).

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