Bug#43827 Server closes connections and restarts

Problem:
  Crash happened with a user-defined utf8 collation,
  on attempt to insert a value longer than the column
  to store.
Reason:
  The "ctype" member was not initialized (NULL) when
  allocating a user-defined utf8 collation, so an attempt
  to call my_ctype(cs, *str) to check if we loose any important
  data when truncating the value made the server crash.
Fix:
  Initializing tge "ctype" member to a proper value.


mysql-test/r/ctype_ldml.result
  Adding tests

mysql-test/t/ctype_ldml.test
  Adding tests

strings/ctype-uca.c
  Adding initialization of "ctype" member.

modified:
  mysql-test/r/ctype_ldml.result
  mysql-test/t/ctype_ldml.test
  strings/ctype-uca.c

1 files changed, 1 insertions, 0 deletions

diff --git a/strings/ctype-uca.c b/strings/ctype-uca.c
index 1ed758bc105..2ea48ddab2f 100644
--- a/strings/ctype-uca.c
+++ b/strings/ctype-uca.c
@@ -7992,6 +7992,7 @@ static my_bool create_tailoring(CHARSET_INFO *cs, void *(*alloc)(size_t))
 static my_bool my_coll_init_uca(CHARSET_INFO *cs, void *(*alloc)(size_t))
 {
   cs->pad_char= ' ';
+  cs->ctype= my_charset_utf8_unicode_ci.ctype;
   return create_tailoring(cs, alloc);
 }