Fixed access privilege bug in query cache.

Change tests to use database 'mysqltest' instead of 'foo'
Add option to not print access denied messages to check_table_access()


Docs/manual.texi:
  Updated query cache information.
client/mysqltest.c:
  When connection to the database '*NO-ONE*, connect without specify a database.
include/raid.h:
  Portability fix
mysql-test/r/drop.result:
  Change test to use database 'mysqltest' instead of 'foo'
mysql-test/r/flush.result:
  Change test to use database 'mysqltest' instead of 'foo'
mysql-test/r/innodb.result:
  Change test to use database 'mysqltest' instead of 'foo'
mysql-test/r/query_cache.result:
  Change test to use database 'mysqltest' instead of 'foo'
mysql-test/t/drop.test:
  Change test to use database 'mysqltest' instead of 'foo'
mysql-test/t/flush.test:
  Change test to use database 'mysqltest' instead of 'foo'
mysql-test/t/innodb.test:
  Change test to use database 'mysqltest' instead of 'foo'
mysql-test/t/query_cache.test:
  Change test to use database 'mysqltest' instead of 'foo'
sql/mysql_priv.h:
  Add option to not print access denied messages
sql/net_pkg.cc:
  Fix for query cache
sql/net_serv.cc:
  Speed improvment
sql/sql_cache.cc:
  Fixed access privilege bug in query cache
sql/sql_cache.h:
  Always compiled with integrity check function prototypes.
sql/sql_do.cc:
  Removed warning
sql/sql_parse.cc:
  Add option to not print access denied messages

Docs/manual.texi

@@ -35574,6 +35574,10 @@ In addition, a query may be seen as different if for instance one
 client is using a new communication protocol format or another
 character set than another client.
 
+Queries that uses different databases, uses different protocol versions
+or the uses different default character sets are considered different
+queries and cached separately.
+
 The cache does work for @code{SELECT CALC_ROWS ...} and
 @code{SELECT FOUND_ROWS() ...} type queries because the number of
 found rows is also stored in the cache.
@@ -35612,8 +35616,12 @@ of the form @code{SELECT * FROM AUTOINCREMENT_FIELD IS NULL}
 However, @code{FOUND ROWS()} will return the correct value,
 even if the preceding query was fetched from the cache.
 
-Queries that don't use any tables are not cached.
+Queries that don't use any tables or if the user has a column privilege for
+any of the involved tables are not cached.
 
+Before a query is fetched from the query cache, MySQL will check that
+the user has SELECT privilege to all the involved databases and
+tables. If this is not the case, the cached result will not be used.
 
 @node Query Cache Configuration, Query Cache in SELECT, Query Cache How, Query Cache
 @subsection Query Cache Configuration

client/mysqltest.c

@@ -1248,7 +1248,8 @@ int close_connection(struct st_query* q)
 }
 
 
-/* this one now is a hack - we may want to improve in in the
+/*
+   This one now is a hack - we may want to improve in in the
    future to handle quotes. For now we assume that anything that is not
    a comma, a space or ) belongs to the argument. space is a chopper, comma or
    ) are delimiters/terminators
@@ -1291,8 +1292,7 @@ int safe_connect(MYSQL* con, const char* host, const char* user,
   int i;
   for (i = 0; i < MAX_CON_TRIES; ++i)
   {
-    if(mysql_real_connect(con, host,user, pass,
-			  db, port, sock, 0))
+    if (mysql_real_connect(con, host,user, pass, db, port, sock, 0))
     {
       con_error = 0;
       break;
@@ -1365,6 +1365,9 @@ int do_connect(struct st_query* q)
     con_sock=fn_format(buff, con_sock, TMPDIR, "",0);
   if (!con_db[0])
     con_db=db;
+  /* Special database to allow one to connect without a database name */
+  if (!strcmp(con_db,"*NO-ONE*"))
+    con_db=0;
   if ((con_error = safe_connect(&next_con->mysql, con_host,
 				con_user, con_pass,
 				con_db, con_port, con_sock ? con_sock: 0)))

include/raid.h

@@ -22,8 +22,10 @@
 #define RAID_DEFAULT_CHUNKS 4
 #define RAID_DEFAULT_CHUNKSIZE 256*1024 /* 256kB */
 
-extern const char *raid_type_string[];
+C_MODE_START
 #define my_raid_type(raid_type)  raid_type_string[(int)(raid_type)]
+extern const char *raid_type_string[];
+C_MODE_END
 
 #if defined(USE_RAID) && !defined(DONT_USE_RAID)
 

mysql-test/r/drop.result

@@ -12,37 +12,37 @@ drop table t1;
 select * from t1;
 n
 1
-drop database if exists foo;
-create database foo;
-drop database if exists foo;
-create database foo;
-create table foo.foo (n int);
-insert into foo.foo values (4);
-select * from foo.foo;
+drop database if exists mysqltest;
+create database mysqltest;
+drop database if exists mysqltest;
+create database mysqltest;
+create table mysqltest.mysqltest (n int);
+insert into mysqltest.mysqltest values (4);
+select * from mysqltest.mysqltest;
 n
 4
-drop database if exists foo;
-create database foo;
-drop database foo;
-drop database if exists foo;
+drop database if exists mysqltest;
+create database mysqltest;
+drop database mysqltest;
+drop database if exists mysqltest;
 flush tables with read lock;
-create database foo;
+create database mysqltest;
 Got one of the listed errors
 unlock tables;
-create database foo;
+create database mysqltest;
 show databases;
 Database
-foo
 mysql
+mysqltest
 test
 flush tables with read lock;
-drop database foo;
+drop database mysqltest;
 Got one of the listed errors
 unlock tables;
-drop database foo;
+drop database mysqltest;
 show databases;
 Database
 mysql
 test
-drop database foo;
-Can't drop database 'foo'. Database doesn't exist
+drop database mysqltest;
+Can't drop database 'mysqltest'. Database doesn't exist

mysql-test/r/flush.result

@@ -11,13 +11,13 @@ drop table t2;
 Table 't2' was locked with a READ lock and can't be updated
  drop table t2;
 unlock tables;
-drop database if exists foo;
-create database foo;
-create table foo.t1(n int);
-insert into foo.t1 values (23);
+drop database if exists mysqltest;
+create database mysqltest;
+create table mysqltest.t1(n int);
+insert into mysqltest.t1 values (23);
 flush tables with read lock;
- drop database foo;
-select * from foo.t1;
+ drop database mysqltest;
+select * from mysqltest.t1;
 n
 23
 unlock tables;

mysql-test/r/grant_cache.result

+drop table if exists test.t1,mysqltest.t1,mysqltest.t2;
+reset query cache;
+flush status;
+create database if not exists mysqltest;
+create table mysqltest.t1 (a int,b int,c int);
+create table mysqltest.t2 (a int,b int,c int);
+insert into mysqltest.t1 values (1,1,1),(2,2,2);
+insert into mysqltest.t2 values (3,3,3);
+create table test.t1 (a char (10));
+insert into test.t1 values ("test.t1");
+select * from t1;
+a
+test.t1
+select * from t1;
+a	b	c
+1	1	1
+2	2	2
+select a from t1;
+a
+1
+2
+select c from t1;
+c
+1
+2
+select * from t2;
+a	b	c
+3	3	3
+select * from mysqltest.t1,test.t1;
+a	b	c	a
+1	1	1	test.t1
+2	2	2	test.t1
+show status like "Qcache_queries_in_cache";
+Variable_name	Value
+Qcache_queries_in_cache	6
+show status like "Qcache_hits%";
+Variable_name	Value
+Qcache_hits	0
+grant SELECT on mysqltest.* to mysqltest_1@localhost;
+grant SELECT on mysqltest.t1 to mysqltest_2@localhost;
+grant SELECT on test.t1 to mysqltest_2@localhost;
+grant SELECT(a) on mysqltest.t1 to mysqltest_3@localhost;
+select "user1";
+user1
+user1
+select * from t1;
+a	b	c
+1	1	1
+2	2	2
+select a from t1 ;
+a
+1
+2
+select c from t1;
+c
+1
+2
+show status like "Qcache_queries_in_cache";
+Variable_name	Value
+Qcache_queries_in_cache	6
+show status like "Qcache_hits";
+Variable_name	Value
+Qcache_hits	3
+show status like "Qcache_not_cached";
+Variable_name	Value
+Qcache_not_cached	1
+select "user2";
+user2
+user2
+select * from t1;
+a	b	c
+1	1	1
+2	2	2
+select a from t1;
+a
+1
+2
+select c from t1;
+c
+1
+2
+select * from mysqltest.t1,test.t1;
+a	b	c	a
+1	1	1	test.t1
+2	2	2	test.t1
+select * from t2;
+select command denied to user: 'mysqltest_2@localhost' for table 't2'
+show status like "Qcache_queries_in_cache";
+Variable_name	Value
+Qcache_queries_in_cache	6
+show status like "Qcache_hits";
+Variable_name	Value
+Qcache_hits	7
+show status like "Qcache_not_cached";
+Variable_name	Value
+Qcache_not_cached	3
+select "user3";
+user3
+user3
+select * from t1;
+select command denied to user: 'mysqltest_3@localhost' for column 'b' in table 't1'
+select a from t1;
+a
+1
+2
+select c from t1;
+select command denied to user: 'mysqltest_3@localhost' for column 'c' in table 't1'
+select * from t2;
+select command denied to user: 'mysqltest_3@localhost' for table 't2'
+select mysqltest.t1.c from test.t1,mysqltest.t1;
+select command denied to user: 'mysqltest_3@localhost' for column 'c' in table 't1'
+show status like "Qcache_queries_in_cache";
+Variable_name	Value
+Qcache_queries_in_cache	6
+show status like "Qcache_hits";
+Variable_name	Value
+Qcache_hits	7
+show status like "Qcache_not_cached";
+Variable_name	Value
+Qcache_not_cached	8
+select "user4";
+user4
+user4
+select a from t1;
+No Database Selected
+select * from mysqltest.t1,test.t1;
+a	b	c	a
+1	1	1	test.t1
+2	2	2	test.t1
+select a from mysqltest.t1;
+a
+1
+2
+select a from mysqltest.t1;
+a
+1
+2
+show status like "Qcache_queries_in_cache";
+Variable_name	Value
+Qcache_queries_in_cache	8
+show status like "Qcache_hits";
+Variable_name	Value
+Qcache_hits	8
+show status like "Qcache_not_cached";
+Variable_name	Value
+Qcache_not_cached	9
+delete from mysql.user where user in ("mysqltest_1","mysqltest_2","mysqltest_3");
+delete from mysql.db where user in ("mysqltest_1","mysqltest_2","mysqltest_3");
+delete from mysql.tables_priv where user in ("mysqltest_1","mysqltest_2","mysqltest_3");
+delete from mysql.columns_priv where user in ("mysqltest_1","mysqltest_2","mysqltest_3");
+flush privileges;
+drop table test.t1,mysqltest.t1,mysqltest.t2;
+drop database mysqltest;

mysql-test/r/innodb.result

@@ -848,16 +848,16 @@ id	name	value	uid
 3	three	three value	103
 6	two	other value	102
 drop table t1;
-create database test_$1;
-create table test_$1.t1 (a int not null) type= innodb;
-insert into test_$1.t1 values(1);
-create table test_$1.t2 (a int not null) type= myisam;
-insert into test_$1.t2 values(1);
-create table test_$1.t3 (a int not null) type= heap;
-insert into test_$1.t3 values(1);
+create database mysqltest;
+create table mysqltest.t1 (a int not null) type= innodb;
+insert into mysqltest.t1 values(1);
+create table mysqltest.t2 (a int not null) type= myisam;
+insert into mysqltest.t2 values(1);
+create table mysqltest.t3 (a int not null) type= heap;
+insert into mysqltest.t3 values(1);
 commit;
-drop database test_$1;
-show tables from test_$1;
+drop database mysqltest;
+show tables from mysqltest;
 Got one of the listed errors
 create table t1 (a int not null) type= innodb;
 insert into t1 values(1),(2);

mysql-test/r/query_cache.result

@@ -346,19 +346,19 @@ show status like "Qcache_queries_in_cache";
 Variable_name	Value
 Qcache_queries_in_cache	0
 drop table t1,t2;
-create database foo;
-create table foo.t1 (i int not null auto_increment, a int, primary key (i));
-insert into foo.t1 (a) values (1);
-select * from foo.t1 where i is null;
+create database mysqltest;
+create table mysqltest.t1 (i int not null auto_increment, a int, primary key (i));
+insert into mysqltest.t1 (a) values (1);
+select * from mysqltest.t1 where i is null;
 i	a
 1	1
-select * from foo.t1;
+select * from mysqltest.t1;
 i	a
 1	1
 show status like "Qcache_queries_in_cache";
 Variable_name	Value
 Qcache_queries_in_cache	1
-drop database foo;
+drop database mysqltest;
 show status like "Qcache_queries_in_cache";
 Variable_name	Value
 Qcache_queries_in_cache	0

mysql-test/t/drop.test

@@ -11,33 +11,33 @@ create table t1(n int);
 drop table t1;
 select * from t1;
 
-#now test for a bug in drop database - it is important that the name
-#of the table is the same as the name of the database - in the original
-#code this triggered a bug
-drop database if exists foo;
-create database foo;
-drop database if exists foo;
-create database foo;
-create table foo.foo (n int);
-insert into foo.foo values (4);
-select * from foo.foo;
-drop database if exists foo;
-create database foo;
-drop database foo;
+# now test for a bug in drop database - it is important that the name
+# of the table is the same as the name of the database - in the original
+# code this triggered a bug
+drop database if exists mysqltest;
+create database mysqltest;
+drop database if exists mysqltest;
+create database mysqltest;
+create table mysqltest.mysqltest (n int);
+insert into mysqltest.mysqltest values (4);
+select * from mysqltest.mysqltest;
+drop database if exists mysqltest;
+create database mysqltest;
+drop database mysqltest;
 
 # test drop/create database and FLUSH TABLES WITH READ LOCK
-drop database if exists foo;
+drop database if exists mysqltest;
 flush tables with read lock;
 --error 1209,1223;
-create database foo;
+create database mysqltest;
 unlock tables;
-create database foo;
+create database mysqltest;
 show databases;
 flush tables with read lock;
 --error 1208,1223;
-drop database foo;
+drop database mysqltest;
 unlock tables;
-drop database foo;
+drop database mysqltest;
 show databases;
 --error 1008
-drop database foo;
+drop database mysqltest;

mysql-test/t/flush.test

@@ -44,15 +44,15 @@ reap;
 
 #test if drop database will wait until we release the global read lock
 connection con1;
-drop database if exists foo;
-create database foo;
-create table foo.t1(n int);
-insert into foo.t1 values (23);
+drop database if exists mysqltest;
+create database mysqltest;
+create table mysqltest.t1(n int);
+insert into mysqltest.t1 values (23);
 flush tables with read lock;
 connection con2;
-send drop database foo;
+send drop database mysqltest;
 connection con1;
-select * from foo.t1;
+select * from mysqltest.t1;
 unlock tables;
 connection con2;
 reap;

mysql-test/t/grant_cache-master.opt

+--set-variable=query_cache_size=1355776

mysql-test/t/grant_cache.test

+#
+# Test grants with query cache
+#
+drop table if exists test.t1,mysqltest.t1,mysqltest.t2;
+reset query cache;
+flush status;
+connect (root,localhost,root,,test,0,master.sock);
+connection root;
+create database if not exists mysqltest;
+
+create table mysqltest.t1 (a int,b int,c int);
+create table mysqltest.t2 (a int,b int,c int);
+insert into mysqltest.t1 values (1,1,1),(2,2,2);
+insert into mysqltest.t2 values (3,3,3);
+create table test.t1 (a char (10));
+insert into test.t1 values ("test.t1");
+select * from t1;
+connect (root2,localhost,root,,mysqltest,0,master.sock);
+connection root2;
+# put queries in cache
+select * from t1;
+select a from t1;
+select c from t1;
+select * from t2;
+select * from mysqltest.t1,test.t1;
+show status like "Qcache_queries_in_cache";
+show status like "Qcache_hits%";
+
+# Create the test users
+grant SELECT on mysqltest.* to mysqltest_1@localhost;
+grant SELECT on mysqltest.t1 to mysqltest_2@localhost;
+grant SELECT on test.t1 to mysqltest_2@localhost;
+grant SELECT(a) on mysqltest.t1 to mysqltest_3@localhost;
+
+# The following queries should be fetched from cache
+connect (user1,localhost,mysqltest_1,,mysqltest,0,master.sock);
+connection user1;
+select "user1";
+select * from t1;
+# The pre and end space are intentional
+ select a from t1 ;
+select c from t1;
+show status like "Qcache_queries_in_cache";
+show status like "Qcache_hits";
+show status like "Qcache_not_cached";
+
+# The following queries should be fetched from cache
+connect (user2,localhost,mysqltest_2,,mysqltest,0,master.sock);
+connection user2;
+select "user2";
+select * from t1;
+select a from t1;
+select c from t1;
+select * from mysqltest.t1,test.t1;
+--error 1142
+select * from t2;
+show status like "Qcache_queries_in_cache";
+show status like "Qcache_hits";
+show status like "Qcache_not_cached";
+
+# The following queries should not be fetched from cache
+connect (user3,localhost,mysqltest_3,,mysqltest,0,master.sock);
+connection user3;
+select "user3";
+--error 1143
+select * from t1;
+select a from t1;
+--error 1143
+select c from t1;
+--error 1142
+select * from t2;
+--error 1143
+select mysqltest.t1.c from test.t1,mysqltest.t1;
+show status like "Qcache_queries_in_cache";
+show status like "Qcache_hits";
+show status like "Qcache_not_cached";
+
+# Connect without a database
+connect (user4,localhost,mysqltest_1,,*NO-ONE*,0,master.sock);
+connection user4;
+select "user4";
+--error 1046
+select a from t1;
+# The following query is not cached before (different database)
+select * from mysqltest.t1,test.t1;
+# Cache a query with 'no database'
+select a from mysqltest.t1;
+select a from mysqltest.t1;
+show status like "Qcache_queries_in_cache";
+show status like "Qcache_hits";
+show status like "Qcache_not_cached";
+
+# Cleanup
+
+connection root;
+delete from mysql.user where user in ("mysqltest_1","mysqltest_2","mysqltest_3");
+delete from mysql.db where user in ("mysqltest_1","mysqltest_2","mysqltest_3");
+delete from mysql.tables_priv where user in ("mysqltest_1","mysqltest_2","mysqltest_3");
+delete from mysql.columns_priv where user in ("mysqltest_1","mysqltest_2","mysqltest_3");
+flush privileges;
+drop table test.t1,mysqltest.t1,mysqltest.t2;
+drop database mysqltest;

mysql-test/t/innodb.test

@@ -518,18 +518,18 @@ drop table t1;
 # Test DROP DATABASE
 #
 
-create database test_$1;
-create table test_$1.t1 (a int not null) type= innodb;
-insert into test_$1.t1 values(1);
-create table test_$1.t2 (a int not null) type= myisam;
-insert into test_$1.t2 values(1);
-create table test_$1.t3 (a int not null) type= heap;
-insert into test_$1.t3 values(1);
+create database mysqltest;
+create table mysqltest.t1 (a int not null) type= innodb;
+insert into mysqltest.t1 values(1);
+create table mysqltest.t2 (a int not null) type= myisam;
+insert into mysqltest.t2 values(1);
+create table mysqltest.t3 (a int not null) type= heap;
+insert into mysqltest.t3 values(1);
 commit;
-drop database test_$1;
+drop database mysqltest;
 # Don't check error message
 --error 12,12
-show tables from test_$1;
+show tables from mysqltest;
 
 #
 # Test truncate table

mysql-test/t/query_cache.test

@@ -235,17 +235,17 @@ drop table t1,t2;
 #
 # noncachable ODBC work around (and prepare cache for drop database)
 #
-create database foo;
-create table foo.t1 (i int not null auto_increment, a int, primary key (i));
-insert into foo.t1 (a) values (1);
-select * from foo.t1 where i is null;
+create database mysqltest;
+create table mysqltest.t1 (i int not null auto_increment, a int, primary key (i));
+insert into mysqltest.t1 (a) values (1);
+select * from mysqltest.t1 where i is null;
 
 #
 # drop db
 #
-select * from foo.t1;
+select * from mysqltest.t1;
 show status like "Qcache_queries_in_cache";
-drop database foo;
+drop database mysqltest;
 show status like "Qcache_queries_in_cache";
 
 #

sql/mysql_priv.h

@@ -283,8 +283,9 @@ uint cached_tables(void);
 void kill_mysql(void);
 void close_connection(NET *net,uint errcode=0,bool lock=1);
 bool check_access(THD *thd,uint access,const char *db=0,uint *save_priv=0,
-		  bool no_grant=0);
-bool check_table_access(THD *thd,uint want_access, TABLE_LIST *tables);
+		  bool no_grant=0, bool no_errors=0);
+bool check_table_access(THD *thd,uint want_access, TABLE_LIST *tables,
+			bool no_errors=0);
 bool check_process_priv(THD *thd=0);
 
 int mysql_backup_table(THD* thd, TABLE_LIST* table_list);

sql/net_pkg.cc

@@ -30,6 +30,7 @@ void send_error(NET *net, uint sql_errno, const char *err)
 		      err ? err : net->last_error[0] ?
 		      net->last_error : "NULL")); 
 
+  query_cache_abort(net);
   if (thd)
     thd->query_error = 1; // needed to catch query errors during replication
   if (!err)
@@ -102,9 +103,9 @@ net_printf(NET *net, uint errcode, ...)
   DBUG_ENTER("net_printf");
   DBUG_PRINT("enter",("message: %u",errcode));
 
-  if(thd) thd->query_error = 1;
-  // if we are here, something is wrong :-)
-
+  if (thd)
+    thd->query_error = 1;	// if we are here, something is wrong :-)
+  query_cache_abort(net);	// Safety
   va_start(args,errcode);
   format=ER(errcode);
   offset= net->return_errno ? 2 : 0;

sql/net_serv.cc

@@ -330,7 +330,8 @@ net_real_write(NET *net,const char *packet,ulong len)
   DBUG_ENTER("net_real_write");
 
 #ifdef MYSQL_SERVER
-  query_cache_insert(net, packet, len);
+  if (net->query_cache_query != 0)
+    query_cache_insert(net, packet, len);
 #endif
 
   if (net->error == 2)

sql/sql_cache.h

@@ -354,7 +354,7 @@ class Query_cache
     Check if the query is in the cache and if this is true send the
     data to client.
   */
-  my_bool send_result_to_client(THD *thd, char *query, uint query_length);
+  int send_result_to_client(THD *thd, char *query, uint query_length);
 
   /* Remove all queries that uses any of the listed following tables */
   void invalidate(TABLE_LIST *tables_used);
@@ -375,7 +375,15 @@ class Query_cache
 
   void destroy();
 
-#ifndef DBUG_OFF
+  friend void query_cache_insert(NET *net, const char *packet, ulong length);
+  friend void query_cache_end_of_result(NET *net);
+  friend void query_cache_abort(NET *net);
+
+  /*
+    The following functions are only used when debugging
+    We don't protect these with ifndef DEBUG_OFF to not have to recompile
+    everything if we want to add checks of the cache at some places.
+  */
   void wreck(uint line, const char *message);
   void bins_dump();
   void cache_dump();
@@ -385,10 +393,6 @@ class Query_cache
   my_bool in_list(Query_cache_block * root, Query_cache_block * point,
 		  const char *name);
   my_bool in_blocks(Query_cache_block * point);
-#endif
-  friend void query_cache_insert(NET *net, const char *packet, ulong length);
-  friend void query_cache_end_of_result(NET *net);
-  friend void query_cache_abort(NET *net);
 };
 
 extern Query_cache query_cache;

sql/sql_do.cc

@@ -22,7 +22,6 @@
 
 int mysql_do(THD *thd, List<Item> &values)
 {
-  int error;
   List_iterator<Item> li(values);
   Item *value;
   DBUG_ENTER("mysql_do");

sql/sql_parse.cc

@@ -842,7 +842,7 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
   {
     char *pos=packet-1+packet_length;		// Point at end null
     /* Remove garage at end of query */
-    while (packet_length > 0 && pos[-1] == ';')
+    while (packet_length > 0 && (pos[-1] == ';' || isspace(pos[-1])))
     {
       pos--;
       packet_length--;
@@ -2261,7 +2261,7 @@ mysql_execute_command(void)
 
 bool
 check_access(THD *thd,uint want_access,const char *db, uint *save_priv,
-	     bool dont_check_global_grants)
+	     bool dont_check_global_grants, bool no_errors)
 {
   uint db_access,dummy;
   if (save_priv)
@@ -2271,7 +2271,8 @@ check_access(THD *thd,uint want_access,const char *db, uint *save_priv,
 
   if ((!db || !db[0]) && !thd->db && !dont_check_global_grants)
   {
-    send_error(&thd->net,ER_NO_DB_ERROR);	/* purecov: tested */
+    if (!no_errors)
+      send_error(&thd->net,ER_NO_DB_ERROR);	/* purecov: tested */
     return TRUE;				/* purecov: tested */
   }
 
@@ -2283,10 +2284,11 @@ check_access(THD *thd,uint want_access,const char *db, uint *save_priv,
   if ((want_access & ~thd->master_access) & ~(DB_ACLS | EXTRA_ACL) ||
       ! db && dont_check_global_grants)
   {						// We can never grant this
-    net_printf(&thd->net,ER_ACCESS_DENIED_ERROR,
-	       thd->priv_user,
-	       thd->host_or_ip,
-	       thd->password ? ER(ER_YES) : ER(ER_NO));/* purecov: tested */
+    if (!no_errors)
+      net_printf(&thd->net,ER_ACCESS_DENIED_ERROR,
+		 thd->priv_user,
+		 thd->host_or_ip,
+		 thd->password ? ER(ER_YES) : ER(ER_NO));/* purecov: tested */
     return TRUE;				/* purecov: tested */
   }
 
@@ -2306,10 +2308,11 @@ check_access(THD *thd,uint want_access,const char *db, uint *save_priv,
       ((grant_option && !dont_check_global_grants) &&
        !(want_access & ~TABLE_ACLS)))
     return FALSE;				/* Ok */
-  net_printf(&thd->net,ER_DBACCESS_DENIED_ERROR,
-	     thd->priv_user,
-	     thd->host_or_ip,
-	     db ? db : thd->db ? thd->db : "unknown"); /* purecov: tested */
+  if (!no_errors)
+    net_printf(&thd->net,ER_DBACCESS_DENIED_ERROR,
+	       thd->priv_user,
+	       thd->host_or_ip,
+	       db ? db : thd->db ? thd->db : "unknown"); /* purecov: tested */
   return TRUE;					/* purecov: tested */
 }
 
@@ -2326,7 +2329,8 @@ bool check_process_priv(THD *thd)
 */
 
 bool
-check_table_access(THD *thd,uint want_access,TABLE_LIST *tables)
+check_table_access(THD *thd,uint want_access,TABLE_LIST *tables,
+		   bool no_errors)
 {
   uint found=0,found_access=0;
   TABLE_LIST *org_tables=tables;
@@ -2341,18 +2345,20 @@ check_table_access(THD *thd,uint want_access,TABLE_LIST *tables)
 	tables->grant.privilege=found_access;
       else
       {
-	if (check_access(thd,want_access,tables->db,&tables->grant.privilege))
+	if (check_access(thd,want_access,tables->db,&tables->grant.privilege,
+			 0, no_errors))
 	  return TRUE;				// Access denied
 	found_access=tables->grant.privilege;
 	found=1;
       }
     }
-    else if (check_access(thd,want_access,tables->db,&tables->grant.privilege))
+    else if (check_access(thd,want_access,tables->db,&tables->grant.privilege,
+			  0, no_errors))
       return TRUE;				// Access denied
   }
   if (grant_option)
     return check_grant(thd,want_access & ~EXTRA_ACL,org_tables,
-		       test(want_access & EXTRA_ACL));
+		       test(want_access & EXTRA_ACL), no_errors);
   return FALSE;
 }
 
@@ -2474,6 +2480,7 @@ mysql_init_query(THD *thd)
   thd->fatal_error=0;				// Safety
   thd->last_insert_id_used=thd->query_start_used=thd->insert_id_used=0;
   thd->sent_row_count=thd->examined_row_count=0;
+  thd->safe_to_cache_query=1;
   DBUG_VOID_RETURN;
 }
 
@@ -2522,9 +2529,8 @@ mysql_parse(THD *thd,char *inBuf,uint length)
 
   mysql_init_query(thd);
   thd->query_length = length;
-  if (query_cache.send_result_to_client(thd, inBuf, length))
+  if (query_cache.send_result_to_client(thd, inBuf, length) <= 0)
   {
-    thd->safe_to_cache_query=1;
     LEX *lex=lex_start(thd, (uchar*) inBuf, length);
     if (!yyparse() && ! thd->fatal_error)
     {