[dovecot] Message with lots of attachments breaks Dovecot

[Tim Hunt]

I have a message with over a 1000 embedded attachments(!), and it breaks
Dovecot. The issue appears to be buffer management. There is some logic
in the function message_part_deserialize_part that seems to assume that
the message part structure is in a contiguous array, but that doesn't
seem to be the case. I haven't been able to figure out enough about the
memory management in Dovecot to fix the problem.

Below is a horrible workaround that just allocates a lot more memory for
the message part array, so that it remains contiguous.

*** mail-index-update.c.orig    Wed Mar 26 10:41:55 2003
--- mail-index-update.c Sun Apr 20 16:53:45 2003
***************
*** 498,504 ****

                 if (cache_fields & DATA_FIELD_MESSAGEPART) {
                         t_push();
!                       buf = buffer_create_dynamic(data_stack_pool, 2048,
                                                     (size_t)-1);
                         message_part_serialize(part, buf);

--- 498,504 ----

                 if (cache_fields & DATA_FIELD_MESSAGEPART) {
                         t_push();
!                       buf = buffer_create_dynamic(data_stack_pool, 51200,
                                                     (size_t)-1);
                         message_part_serialize(part, buf);