mysqladmin crash on execution of below command:

  #> mysqladmin -u root -p

  ...

  Segmentation fault (core dumped)

This is probably caused by memory corruption based on working with temp_argv[-1].

RHBZ: #1207041

Upstream report: https://mariadb.atlassian.net/browse/MDEV-7883

diff -up mariadb-5.5.41/client/mysqladmin.cc.bz1207041 mariadb-5.5.41/client/mysqladmin.cc

--- mariadb-5.5.41/client/mysqladmin.cc.bz1207041	2015-03-30 12:37:31.078880914 +0200

+++ mariadb-5.5.41/client/mysqladmin.cc	2015-03-30 13:03:32.442152833 +0200

@@ -1266,7 +1266,8 @@ static char **mask_password(int argc, ch

      }

     argc--;

   }

-  temp_argv[argc]= my_strdup((*argv)[argc], MYF(MY_FAE));

+  if (argc >= 0)

+    temp_argv[argc]= my_strdup((*argv)[argc], MYF(MY_FAE));

   return(temp_argv);

 }