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MDEV-4801 - Server crashes in my_strdup on setting

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innodb_ft_user_stopword_table to DEFAULT

Setting plugin string variable with PLUGIN_VAR_MEMALLOC flag
to NULL causes server crash.

mysql-test/suite/sys_vars/r/innodb_ft_user_stopword_table_basic.result:
  Reset innodb_ft_user_stopword_table. Also tests MDEV-4801.
mysql-test/suite/sys_vars/t/innodb_ft_user_stopword_table_basic.test:
  Reset innodb_ft_user_stopword_table. Also tests MDEV-4801.
sql/sql_plugin.cc:
  When we got NULL value, do not strdup(NULL).
This commit is contained in:
Sergey Vojtovich
2013-08-06 14:02:07 +04:00
parent 9d1f31fb4b
commit 5997156b9b
3 changed files with 8 additions and 3 deletions
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9
sql/sql_plugin.cc
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@ -2700,13 +2700,16 @@ static void update_func_longlong(THD *thd, struct st_mysql_sys_var *var,
static void update_func_str(THD *thd, struct st_mysql_sys_var *var,
void *tgt, const void *save)
{
char *old= *(char **) tgt;
*(char **)tgt= *(char **) save;
char *value= *(char**) save;
if (var->flags & PLUGIN_VAR_MEMALLOC)
{
*(char **)tgt= my_strdup(*(char **) save, MYF(0));
char *old= *(char**) tgt;
if (value)
*(char**) tgt= my_strdup(value, MYF(0));
my_free(old);
}
else
*(char**) tgt= value;
}