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bug #16017 (memory leaks in embedded server)

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There actually was 3 different problems -
hash_user_connections wasn't cleaned
one strdupped database name wasn't freed
and stmt->mem_root wasn't cleaned as it was
replased with mysql->field_alloc for result
For the last one - i made the library using stmt's
fields to store result if it's the case.
This commit is contained in:
holyfoot@deer.(none)
2006-06-01 17:06:42 +05:00
parent cb4c6a0ded
commit bc35c50063
8 changed files with 74 additions and 48 deletions
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18
sql/sql_parse.cc
View File

@@ -54,8 +54,8 @@ extern "C" int gethostname(char *name, int namelen);
static void time_out_user_resource_limits(THD *thd, USER_CONN *uc);
#ifndef NO_EMBEDDED_ACCESS_CHECKS
static int check_for_max_user_connections(THD *thd, USER_CONN *uc);
#endif
static void decrease_user_connections(USER_CONN *uc);
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
static bool check_db_used(THD *thd,TABLE_LIST *tables);
static bool check_multi_update_lock(THD *thd, TABLE_LIST *tables,
List<Item> *fields, SELECT_LEX *select_lex);
@@ -137,6 +137,7 @@ inline bool all_tables_not_ok(THD *thd, TABLE_LIST *tables)
#endif
#ifndef NO_EMBEDDED_ACCESS_CHECKS
static HASH hash_user_connections;
static int get_or_create_user_conn(THD *thd, const char *user,
@@ -190,6 +191,7 @@ end:
return return_val;
}
#endif /* !NO_EMBEDDED_ACCESS_CHECKS */
/*
@@ -231,11 +233,7 @@ int check_user(THD *thd, enum enum_server_command command,
thd->db= 0;
thd->db_length= 0;
if (mysql_change_db(thd, db))
{
if (thd->user_connect)
decrease_user_connections(thd->user_connect);
DBUG_RETURN(-1);
}
}
else
send_ok(thd);
@@ -409,10 +407,12 @@ extern "C" void free_user(struct user_conn *uc)
void init_max_user_conn(void)
{
#ifndef NO_EMBEDDED_ACCESS_CHECKS
(void) hash_init(&hash_user_connections,system_charset_info,max_connections,
0,0,
(hash_get_key) get_key_conn, (hash_free_key) free_user,
0);
#endif
}
@@ -466,7 +466,6 @@ static int check_for_max_user_connections(THD *thd, USER_CONN *uc)
(void) pthread_mutex_unlock(&LOCK_user_conn);
DBUG_RETURN(error);
}
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
/*
Decrease user connection count
@@ -500,13 +499,18 @@ static void decrease_user_connections(USER_CONN *uc)
DBUG_VOID_RETURN;
}
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
void free_max_user_conn(void)
{
#ifndef NO_EMBEDDED_ACCESS_CHECKS
hash_free(&hash_user_connections);
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
}
/*
Mark all commands that somehow changes a table
This is used to check number of updates / hour
@@ -1476,9 +1480,11 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
}
else
{
#ifndef NO_EMBEDDED_ACCESS_CHECKS
/* we've authenticated new user */
if (save_user_connect)
decrease_user_connections(save_user_connect);
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
x_free((gptr) save_db);
x_free((gptr) save_user);
}