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Bug#29363867: LOST CONNECTION TO MYSQL SERVER DURING QUERY

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plugin variables in SET  only locked the plugin till the end of the
statement. If SET with a plugin variable was prepared, it was possible
to uninstall the plugin before EXECUTE. Then EXECUTE would crash,
trying to resolve a now-invalid pointer to a disappeared variable.

Fix: keep plugins locked until the prepared statement is closed.
This commit is contained in:
Sergei Golubchik
2021-04-26 22:32:58 +02:00
parent 4f63b6cf53
commit 91599701d0
5 changed files with 89 additions and 27 deletions
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4
sql/sql_lex.h
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@ -3412,8 +3412,8 @@ extern void lex_init(void);
extern void lex_free(void);
extern void lex_start(THD *thd);
extern void lex_end(LEX *lex);
extern void lex_end_stage1(LEX *lex);
extern void lex_end_stage2(LEX *lex);
extern void lex_end_nops(LEX *lex);
extern void lex_unlock_plugins(LEX *lex);
void end_lex_with_single_table(THD *thd, TABLE *table, LEX *old_lex);
int init_lex_with_single_table(THD *thd, TABLE *table, LEX *lex);
extern int MYSQLlex(union YYSTYPE *yylval, THD *thd);