bzr commit into mysql-5.1 branch (luis.soares:2689) Bug#28796

[Luis Soares]

#At file:///stuff/workspace/mysql-server/bugfix/5.1-rpl-28796/

 2689 Luis Soares	2008-11-01
      BUG#28796: Checks wether host argument is an empty string or not. If empty, reports an error to the client and returns, otherwise continue normally.
modified:
  sql/sql_repl.cc

=== modified file 'sql/sql_repl.cc'
--- a/sql/sql_repl.cc	2008-09-29 05:36:42 +0000
+++ b/sql/sql_repl.cc	2008-11-01 01:02:50 +0000
@@ -1088,6 +1088,15 @@ bool change_master(THD* thd, Master_info
 
   thd_proc_info(thd, "Changing master");
   LEX_MASTER_INFO* lex_mi= &thd->lex->mi;
+
+  /* checks whether host argument is an empty string or not. */
+  if(lex_mi->host && strcmp(lex_mi->host, "") == 0) 
+  {
+    my_error(ER_WRONG_ARGUMENTS, MYF(0), "MASTER_HOST");
+    unlock_slave_threads(mi);
+    DBUG_RETURN(TRUE);
+  }
+
   // TODO: see if needs re-write
   if (init_master_info(mi, master_info_file, relay_log_info_file, 0,
 		       thread_mask))