The crash happens because of incorrect max_length calculation
in QUOTE function(due to overflow). max_length is set
to 0 and it leads to assert failure.
The fix is to cast expression result to
ulonglong variable and adjust it if the
result exceeds MAX_BLOB_WIDTH.


mysql-test/r/func_str.result:
  test case
mysql-test/t/func_str.test:
  test case
sql/item_strfunc.h:
  cast expression result to ulonglong variable and
  adjust it if the result exceeds MAX_BLOB_WIDTH.