Memory corruption in mariadb_dyncol_unpack

static int dyncol_win_crash()

{

  int rc;

  uint i;

  uint num_keys[5]= {1,2,3,4,5};

  char *strval[]= {"Val1", "Val2", "Val3", "Val4", "Val5"};

  DYNAMIC_COLUMN_VALUE vals[5];

  DYNAMIC_COLUMN dynstr;

  MYSQL_LEX_STRING my_key= {"1", 2};

  uint unpack_columns= 0;

  MYSQL_LEX_STRING *unpack_keys= 0;

  DYNAMIC_COLUMN_VALUE *unpack_vals= 0;

  for (i=0; i < 5; i++)

  {

    vals[i].type= DYN_COL_STRING;

    vals[i].x.string.value.str= strval[i];

    vals[i].x.string.value.length= strlen(strval[i]);

    vals[i].x.string.charset= &my_charset_latin1;

  }

  mariadb_dyncol_init(&dynstr);

  /* create numeric */

  rc= mariadb_dyncol_create_many_num(&dynstr, 5, num_keys, vals, 1);

  rc= mariadb_dyncol_unpack(&dynstr, &unpack_columns, &unpack_keys, &unpack_vals);

  for (i=0; i < unpack_columns; i++)

    if (memcmp(unpack_vals[i].x.string.value.str, vals[i].x.string.value.str, vals[i].x.string.value.length))

      printf("Error1: key: %1s val: %s %s}\n", unpack_keys[i].str, unpack_vals[i].x.string.value.str, vals[i].x.string.value.str);

  free(unpack_keys);

  free(unpack_vals);

}