diff -Naurp mysql-cluster-gpl-7.1.3/mysql-test/r/plugin_not_embedded.result mysql-cluster-gpl-7.1.3.oden/mysql-test/r/plugin_not_embedded.result
--- mysql-cluster-gpl-7.1.3/mysql-test/r/plugin_not_embedded.result	1970-01-01 01:00:00.000000000 +0100
+++ mysql-cluster-gpl-7.1.3.oden/mysql-test/r/plugin_not_embedded.result	2010-05-26 13:53:21.873332202 +0200
@@ -0,0 +1,11 @@
+#
+# Bug#51770: UNINSTALL PLUGIN requires no privileges
+#
+GRANT INSERT ON mysql.plugin TO bug51770@localhost;
+INSTALL PLUGIN example SONAME 'ha_example.so';
+UNINSTALL PLUGIN example;
+ERROR 42000: DELETE command denied to user 'bug51770'@'localhost' for table 'plugin'
+GRANT DELETE ON mysql.plugin TO bug51770@localhost;
+FLUSH PRIVILEGES;
+UNINSTALL PLUGIN example;
+DROP USER bug51770@localhost;
diff -Naurp mysql-cluster-gpl-7.1.3/mysql-test/t/plugin_not_embedded-master.opt mysql-cluster-gpl-7.1.3.oden/mysql-test/t/plugin_not_embedded-master.opt
--- mysql-cluster-gpl-7.1.3/mysql-test/t/plugin_not_embedded-master.opt	1970-01-01 01:00:00.000000000 +0100
+++ mysql-cluster-gpl-7.1.3.oden/mysql-test/t/plugin_not_embedded-master.opt	2010-05-26 13:53:21.873332202 +0200
@@ -0,0 +1 @@
+$EXAMPLE_PLUGIN_OPT
diff -Naurp mysql-cluster-gpl-7.1.3/mysql-test/t/plugin_not_embedded.test mysql-cluster-gpl-7.1.3.oden/mysql-test/t/plugin_not_embedded.test
--- mysql-cluster-gpl-7.1.3/mysql-test/t/plugin_not_embedded.test	1970-01-01 01:00:00.000000000 +0100
+++ mysql-cluster-gpl-7.1.3.oden/mysql-test/t/plugin_not_embedded.test	2010-05-26 13:53:21.874331837 +0200
@@ -0,0 +1,20 @@
+--source include/not_embedded.inc
+--source include/have_example_plugin.inc
+
+--echo #
+--echo # Bug#51770: UNINSTALL PLUGIN requires no privileges
+--echo #
+
+GRANT INSERT ON mysql.plugin TO bug51770@localhost;
+connect(con1,localhost,bug51770,,);
+eval INSTALL PLUGIN example SONAME $HA_EXAMPLE_SO;
+--error ER_TABLEACCESS_DENIED_ERROR
+UNINSTALL PLUGIN example;
+connection default;
+GRANT DELETE ON mysql.plugin TO bug51770@localhost;
+FLUSH PRIVILEGES;
+connection con1;
+UNINSTALL PLUGIN example;
+disconnect con1;
+connection default;
+DROP USER bug51770@localhost;
diff -Naurp mysql-cluster-gpl-7.1.3/sql/sql_plugin.cc mysql-cluster-gpl-7.1.3.oden/sql/sql_plugin.cc
--- mysql-cluster-gpl-7.1.3/sql/sql_plugin.cc	2010-03-29 16:51:28.000000000 +0200
+++ mysql-cluster-gpl-7.1.3.oden/sql/sql_plugin.cc	2010-05-26 13:53:21.874331837 +0200
@@ -1739,6 +1739,8 @@ bool mysql_uninstall_plugin(THD *thd, co
   bzero(&tables, sizeof(tables));
   tables.db= (char *)"mysql";
   tables.table_name= tables.alias= (char *)"plugin";
+  if (check_table_access(thd, DELETE_ACL, &tables, 1, FALSE))
+    DBUG_RETURN(TRUE);
 
   /* need to open before acquiring LOCK_plugin or it will deadlock */
   if (! (table= open_ltable(thd, &tables, TL_WRITE, 0)))