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Unsifficient limit check aims to security issue.

MariaDB upstream fix: http://bazaar.launchpad.net/~maria-captains/maria/5.5/revision/2502.565.64
RHBZ#1059545

diff -up mysql-5.6.15/client/mysql.cc.bz1059545 mysql-5.6.15/client/mysql.cc
--- mysql-5.6.15/client/mysql.cc.bz1059545	2014-01-30 18:09:47.209588217 +0100
+++ mysql-5.6.15/client/mysql.cc	2014-01-30 18:09:59.016581192 +0100
@@ -1315,7 +1315,7 @@ int main(int argc,char *argv[])
 
   put_info("Welcome to the MySQL monitor.  Commands end with ; or \\g.",
 	   INFO_INFO);
-  sprintf((char*) glob_buffer.ptr(),
+  my_snprintf((char*) glob_buffer.ptr(), glob_buffer.alloced_length(),
 	  "Your MySQL connection id is %lu\nServer version: %s\n",
 	  mysql_thread_id(&mysql), server_version_string(&mysql));
   put_info((char*) glob_buffer.ptr(),INFO_INFO);