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MDEV-23666: Assertion `m_cpp_buf <= ptr && ptr <= m_cpp_buf + m_buf_length' failed in Lex_input_stream::body_utf8_append

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On parsing statements for which a starting backtick (`) delimiter doesn't have
a corresponding ending backtick, a current pointer to a position inside a
pre-processed buffer could go beyond the end of the buffer.

This bug report caused by the commit d496765903
  "MDEV-22022 Various mangled SQL statements will crash 10.3 to 10.5 debug builds".

In order to fix the issue both pointers m_ptr and m_cpp_ptr must be
rolled back to previous position in raw input and pre-processed input streams
correspondingly in case end of query reached during parsing.
This commit is contained in:
Dmitry Shulga
2021-01-14 14:31:20 +07:00
parent fb9a9599bc
commit f130adbf35
3 changed files with 26 additions and 0 deletions
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9
mysql-test/main/parser.result
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@ -1784,4 +1784,13 @@ EXECUTE IMMEDIATE 'if(`systeminfo /FO LIST';
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '`systeminfo /FO LIST' at line 1
EXECUTE IMMEDIATE 'if(`systeminfo';
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '`systeminfo' at line 1
#
# MDEV-23666 Assertion failed in Lex_input_stream::body_utf8_append
#
SET @@sql_mode='ANSI_QUOTES';
EXECUTE IMMEDIATE 'CREATE PROCEDURE p() UPDATE t SET c=\'\'"';
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '"' at line 1
EXECUTE IMMEDIATE 'CREATE PROCEDURE p() UPDATE t SET c=\'\'"abc';
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '"abc' at line 1
SET @@sql_mode=@save_sql_mode;
# End of 10.3 tests