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MDEV-34205: ASAN stack buffer overflow in strxnmov() in frm_file_exists

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Correct the second parameter for strxnmov to prevent potential buffer
overflows. The second parameter must be one less than the size of the
input buffer to avoid writing past the end of the buffer.

While the second parameter is usually correct, there are exceptions
that need fixing.

This commit addresses the issue within frm_file_exists() and other
affected places.
This commit is contained in:
Vladislav Vaintroub
2024-05-21 16:03:13 +02:00
parent 7c4c082349
commit 736449d30f
7 changed files with 16 additions and 5 deletions
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6
mysql-test/main/drop.test
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@ -361,3 +361,9 @@ drop table mysqltest.does_not_exists;
drop database mysqltest;
drop database mysqltest;
set @@session.sql_if_exists=0;
--echo #
--echo # MDEV-34205 ASAN stack-buffer-overflow in strxnmov | frm_file_exists
--echo #
--error ER_BAD_TABLE_ERROR
DROP TABLE `##################################################_long`.`#################################################_long`;