diff --git a/mysql-test/r/ctype_latin2_ch.result b/mysql-test/r/ctype_latin2_ch.result
index 2b3765c07c4..5b607872737 100644
--- a/mysql-test/r/ctype_latin2_ch.result
+++ b/mysql-test/r/ctype_latin2_ch.result
@@ -28,3 +28,4 @@ select * from t1 ignore index (primary) where tt like 'AA%';
 id	tt
 select * from t1 where tt like '%AA%';
 id	tt
+drop table t1;
diff --git a/mysql-test/r/grant2.result b/mysql-test/r/grant2.result
index a42ad0d79a5..eb9e95c40bd 100644
--- a/mysql-test/r/grant2.result
+++ b/mysql-test/r/grant2.result
@@ -356,3 +356,17 @@ insert into mysql.user select * from t1;
 drop table t1, t2;
 drop database TESTDB;
 flush privileges;
+grant all privileges on test.* to `a@`@localhost;
+grant execute on * to `a@`@localhost;
+create table t2 (s1 int);
+insert into t2 values (1);
+drop function if exists f2;
+create function f2 () returns int begin declare v int; select s1 from t2
+into v; return v; end//
+select f2();
+f2()
+1
+drop function f2;
+drop table t2;
+REVOKE ALL PRIVILEGES, GRANT OPTION FROM `a@`@localhost;
+drop user `a@`@localhost;
diff --git a/mysql-test/r/openssl_1.result b/mysql-test/r/openssl_1.result
index 77f2d5495a9..91382619b6c 100644
--- a/mysql-test/r/openssl_1.result
+++ b/mysql-test/r/openssl_1.result
@@ -38,7 +38,6 @@ f1
 5
 delete from t1;
 ERROR 42000: DELETE command denied to user 'ssl_user4'@'localhost' for table 't1'
-delete from mysql.user where user='ssl_user%';
-delete from mysql.db where user='ssl_user%';
-flush privileges;
+drop user ssl_user1@localhost, ssl_user2@localhost,
+ssl_user3@localhost, ssl_user4@localhost;
 drop table t1;
diff --git a/mysql-test/r/rpl_openssl.result b/mysql-test/r/rpl_openssl.result
index d916e9f2c5c..c10606bc03f 100644
--- a/mysql-test/r/rpl_openssl.result
+++ b/mysql-test/r/rpl_openssl.result
@@ -24,7 +24,8 @@ Slave_IO_State	Master_Host	Master_User	Master_Port	Connect_Retry	Master_Log_File
 stop slave;
 change master to master_user='root',master_password='', master_ssl=0;
 start slave;
+drop user replssl@localhost;
 drop table t1;
 show slave status;
 Slave_IO_State	Master_Host	Master_User	Master_Port	Connect_Retry	Master_Log_File	Read_Master_Log_Pos	Relay_Log_File	Relay_Log_Pos	Relay_Master_Log_File	Slave_IO_Running	Slave_SQL_Running	Replicate_Do_DB	Replicate_Ignore_DB	Replicate_Do_Table	Replicate_Ignore_Table	Replicate_Wild_Do_Table	Replicate_Wild_Ignore_Table	Last_Errno	Last_Error	Skip_Counter	Exec_Master_Log_Pos	Relay_Log_Space	Until_Condition	Until_Log_File	Until_Log_Pos	Master_SSL_Allowed	Master_SSL_CA_File	Master_SSL_CA_Path	Master_SSL_Cert	Master_SSL_Cipher	Master_SSL_Key	Seconds_Behind_Master
-#	127.0.0.1	root	MASTER_MYPORT	1	master-bin.000001	474	#	#	master-bin.000001	Yes	Yes							0		0	474	#	None		0	No	MYSQL_TEST_DIR/std_data/cacert.pem		MYSQL_TEST_DIR/std_data/client-cert.pem		MYSQL_TEST_DIR/std_data/client-key.pem	#
+#	127.0.0.1	root	MASTER_MYPORT	1	master-bin.000001	564	#	#	master-bin.000001	Yes	Yes							0		0	564	#	None		0	No	MYSQL_TEST_DIR/std_data/cacert.pem		MYSQL_TEST_DIR/std_data/client-cert.pem		MYSQL_TEST_DIR/std_data/client-key.pem	#
diff --git a/mysql-test/r/sp-security.result b/mysql-test/r/sp-security.result
index 896b6fa572c..04f2f58ba37 100644
--- a/mysql-test/r/sp-security.result
+++ b/mysql-test/r/sp-security.result
@@ -322,6 +322,7 @@ Warnings:
 Warning	1287	'SHOW INNODB STATUS' is deprecated; use 'SHOW ENGINE INNODB STATUS' instead
 GRANT EXECUTE ON PROCEDURE p1 TO user_bug7787@localhost;
 DROP DATABASE db_bug7787;
+drop user user_bug7787@localhost;
 use test;
 
 ---> connection: root
diff --git a/mysql-test/r/sp_notembedded.result b/mysql-test/r/sp_notembedded.result
index d434f5c32ce..e39ddd1d79d 100644
--- a/mysql-test/r/sp_notembedded.result
+++ b/mysql-test/r/sp_notembedded.result
@@ -204,3 +204,4 @@ drop procedure bug10100pv|
 drop procedure bug10100pd|
 drop procedure bug10100pc|
 drop view v1|
+drop table t3|
diff --git a/mysql-test/r/trigger.result b/mysql-test/r/trigger.result
index 681b805f547..f897af6d69f 100644
--- a/mysql-test/r/trigger.result
+++ b/mysql-test/r/trigger.result
@@ -949,7 +949,7 @@ insert into t1 values
 create function f2() returns int return (select max(b) from t2);
 insert into t2 select a, f2() from t1;
 load data infile '../std_data_ln/words.dat' into table t1 (a) set b:= f1();
-drop table t1;
+drop table t1, t2;
 drop function f1;
 drop function f2;
 DROP TABLE IF EXISTS t1;
diff --git a/mysql-test/t/ctype_latin2_ch.test b/mysql-test/t/ctype_latin2_ch.test
index 626d83fa17d..3925d02659d 100644
--- a/mysql-test/t/ctype_latin2_ch.test
+++ b/mysql-test/t/ctype_latin2_ch.test
@@ -28,3 +28,5 @@ select * from t1 ignore index (primary) where tt like 'AA%';
 select * from t1 where tt like '%AA%';
 
 # End of 4.1 tests
+
+drop table t1;
diff --git a/mysql-test/t/grant2.test b/mysql-test/t/grant2.test
index 2c62d2f1bd3..2b9a273df7e 100644
--- a/mysql-test/t/grant2.test
+++ b/mysql-test/t/grant2.test
@@ -465,3 +465,29 @@ drop table t1, t2;
 drop database TESTDB;
 flush privileges;
 
+#
+# BUG#13310 incorrect user parsing by SP
+#
+
+grant all privileges on test.* to `a@`@localhost;
+grant execute on * to `a@`@localhost;
+connect (bug13310,localhost,'a@',,test);
+connection bug13310;
+create table t2 (s1 int);
+insert into t2 values (1);
+--disable_warnings
+drop function if exists f2;
+--enable_warnings
+delimiter //;
+create function f2 () returns int begin declare v int; select s1 from t2
+into v; return v; end//
+delimiter ;//
+select f2();
+
+drop function f2;
+drop table t2;
+disconnect bug13310;
+
+connection default;
+REVOKE ALL PRIVILEGES, GRANT OPTION FROM `a@`@localhost;
+drop user `a@`@localhost;
diff --git a/mysql-test/t/openssl_1.test b/mysql-test/t/openssl_1.test
index 359b8b69a4d..4cc9113048f 100644
--- a/mysql-test/t/openssl_1.test
+++ b/mysql-test/t/openssl_1.test
@@ -48,9 +48,9 @@ select * from t1;
 delete from t1;
 
 connection default;
-delete from mysql.user where user='ssl_user%';
-delete from mysql.db where user='ssl_user%';
-flush privileges;
+drop user ssl_user1@localhost, ssl_user2@localhost,
+ssl_user3@localhost, ssl_user4@localhost;
+
 drop table t1;
 
 # End of 4.1 tests
diff --git a/mysql-test/t/rpl_openssl.test b/mysql-test/t/rpl_openssl.test
index e15eb9b179a..7d769ad448e 100644
--- a/mysql-test/t/rpl_openssl.test
+++ b/mysql-test/t/rpl_openssl.test
@@ -53,6 +53,7 @@ stop slave;
 change master to master_user='root',master_password='', master_ssl=0;
 start slave;
 connection master;
+drop user replssl@localhost;
 drop table t1;
 save_master_pos;
 connection slave;
diff --git a/mysql-test/t/sp-security.test b/mysql-test/t/sp-security.test
index f369dc64b0e..a8c3c0a22eb 100644
--- a/mysql-test/t/sp-security.test
+++ b/mysql-test/t/sp-security.test
@@ -545,6 +545,7 @@ GRANT EXECUTE ON PROCEDURE p1 TO user_bug7787@localhost;
 # Cleanup.
 
 DROP DATABASE db_bug7787;
+drop user user_bug7787@localhost;
 use test;
 
 
diff --git a/mysql-test/t/sp_notembedded.test b/mysql-test/t/sp_notembedded.test
index 3854297ec0c..4eb429156b2 100644
--- a/mysql-test/t/sp_notembedded.test
+++ b/mysql-test/t/sp_notembedded.test
@@ -258,5 +258,6 @@ drop procedure bug10100pv|
 drop procedure bug10100pd|
 drop procedure bug10100pc|
 drop view v1|
+drop table t3|
 
 delimiter ;|
diff --git a/mysql-test/t/trigger.test b/mysql-test/t/trigger.test
index a0b67b2204d..8f225b1ef0d 100644
--- a/mysql-test/t/trigger.test
+++ b/mysql-test/t/trigger.test
@@ -1111,7 +1111,7 @@ insert into t1 values
 create function f2() returns int return (select max(b) from t2);
 insert into t2 select a, f2() from t1;
 load data infile '../std_data_ln/words.dat' into table t1 (a) set b:= f1();
-drop table t1;
+drop table t1, t2;
 drop function f1;
 drop function f2;
 
diff --git a/sql/sql_parse.cc b/sql/sql_parse.cc
index 38eadb5a738..1321342c210 100644
--- a/sql/sql_parse.cc
+++ b/sql/sql_parse.cc
@@ -992,6 +992,7 @@ static int check_connection(THD *thd)
 
   char *user= end;
   char *passwd= strend(user)+1;
+  uint user_len= passwd - user - 1;
   char *db= passwd;
   char db_buff[NAME_LEN+1];                     // buffer to store db in utf8
   char user_buff[USERNAME_LENGTH+1];		// buffer to store user in utf8
@@ -1017,11 +1018,19 @@ static int check_connection(THD *thd)
     db= db_buff;
   }
 
-  user_buff[copy_and_convert(user_buff, sizeof(user_buff)-1,
-                             system_charset_info, user, strlen(user),
-                             thd->charset(), &dummy_errors)]= '\0';
+  user_buff[user_len= copy_and_convert(user_buff, sizeof(user_buff)-1,
+                                       system_charset_info, user, user_len,
+                                       thd->charset(), &dummy_errors)]= '\0';
   user= user_buff;
 
+  /* If username starts and ends in "'", chop them off */
+  if (user_len > 1 && user[0] == '\'' && user[user_len - 1] == '\'')
+  {
+    user[user_len-1]= 0;
+    user++;
+    user_len-= 2;
+  }
+
   if (thd->main_security_ctx.user)
     x_free(thd->main_security_ctx.user);
   if (!(thd->main_security_ctx.user= my_strdup(user, MYF(0))))