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Bug#33982 debug assertion and crash reloading grant tables after sighup or kill

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In certain rare cases when a process was interrupted
during a FLUSH PRIVILEGES operation the diagnostic
area would be set to an error state but the function
responsible for the operation would still signal
success. This would lead to a debug assertion error
later on when the server would attempt to reset the
DA before sending the error message.

This patch fixes the issue by assuring that
reload_acl_and_cache() always fails if an error
condition is raised.

The second issue was that a KILL could cause
a console error message which referred to a DA
state without first making sure that such a
state existed.

This patch fixes this issue in two different
palces by first checking DA state before
fetching the error message.

 

sql/sql_acl.cc:
  * Make sure that there is an error to print before attempting to do so.
  * Minor style change: change 1 to TRUE for clarity.
sql/sql_parse.cc:
  * Always fail reload_acl_and_cache() if the query was killed.
sql/sql_servers.cc:
  * Make sure that there is an error to print before attempting to do so.
This commit is contained in:
Kristofer Pettersson 2010-01-13 12:39:00 +01:00
parent be397eb400
commit b3dd4d9486
3 changed files with 24 additions and 10 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

15
sql/sql_acl.cc
View file

@ -310,7 +310,7 @@ static my_bool acl_load(THD *thd, TABLE_LIST *tables)
{
TABLE *table;
READ_RECORD read_record_info;
my_bool return_val= 1;
my_bool return_val= TRUE;
bool check_no_resolve= specialflag & SPECIAL_NO_RESOLVE;
char tmp_name[NAME_LEN+1];
int password_length;
@ -623,7 +623,7 @@ static my_bool acl_load(THD *thd, TABLE_LIST *tables)
init_check_host();
initialized=1;
return_val=0;
return_val= FALSE;
end:
thd->variables.sql_mode= old_sql_mode;
@ -674,7 +674,7 @@ my_bool acl_reload(THD *thd)
DYNAMIC_ARRAY old_acl_hosts,old_acl_users,old_acl_dbs;
MEM_ROOT old_mem;
bool old_initialized;
my_bool return_val= 1;
my_bool return_val= TRUE;
DBUG_ENTER("acl_reload");
if (thd->locked_tables)
@ -701,8 +701,13 @@ my_bool acl_reload(THD *thd)
if (simple_open_n_lock_tables(thd, tables))
{
sql_print_error("Fatal error: Can't open and lock privilege tables: %s",
thd->main_da.message());
/*
Execution might have been interrupted; only print the error message
if an error condition has been raised.
*/
if (thd->main_da.is_error())
sql_print_error("Fatal error: Can't open and lock privilege tables: %s",
thd->main_da.message());
goto end;
}

9
sql/sql_parse.cc
View file

@ -6787,13 +6787,13 @@ bool reload_acl_and_cache(THD *thd, ulong options, TABLE_LIST *tables,
thd->store_globals();
lex_start(thd);
}
if (thd)
{
bool reload_acl_failed= acl_reload(thd);
bool reload_grants_failed= grant_reload(thd);
bool reload_servers_failed= servers_reload(thd);
if (reload_acl_failed || reload_grants_failed || reload_servers_failed)
{
result= 1;
@ -6949,7 +6949,10 @@ bool reload_acl_and_cache(THD *thd, ulong options, TABLE_LIST *tables,
if (options & REFRESH_USER_RESOURCES)
reset_mqh((LEX_USER *) NULL, 0); /* purecov: inspected */
*write_to_binlog= tmp_write_to_binlog;
return result;
/*
If the query was killed then this function must fail.
*/
return result || thd->killed;
}

10
sql/sql_servers.cc
View file

@ -241,8 +241,14 @@ bool servers_reload(THD *thd)
if (simple_open_n_lock_tables(thd, tables))
{
sql_print_error("Can't open and lock privilege tables: %s",
thd->main_da.message());
/*
Execution might have been interrupted; only print the error message
if an error condition has been raised.
*/
if (thd->main_da.is_error())
sql_print_error("Can't open and lock privilege tables: %s",
thd->main_da.message());
return_val= FALSE;
goto end;
}