null pointer crash in lib11_trash_plugin.so

[Nik Soggia via dovecot]

dovecot crashes if you don't explicitly set "trash_priority" on all namespace 
mailboxes.

Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00007f6af06b4563 in trash_try_mailbox (error_r=0x7ffcf37077b8, 
box_name=0x56384813f980 "Drafts", ns=0x5638481423b0) at trash-plugin.c:582
(gdb) print trash_set
$1 = (const struct trash_settings *) 0x0


unsigned int trash_priority = trash_set->trash_priority;
                           // ^^^^^^^^^ SIGSEGV if NULL

here is my configuration, to stop it from crashing uncomment the two "trash_priority 
= 0".
cheers

# 2.4.1-4 (7d8c0e5759): /etc/dovecot/dovecot.conf
# Pigeonhole version 2.4.0 (1b2d5bb9)
# OS: Linux 6.12.32 x86_64 Slackware 15.0 ext4
# Hostname: niksoggia.it
# 4 default setting changes since version 2.4.0
dovecot_config_version = 2.4.0
auth_master_user_separator = *
dovecot_storage_version = 2.4.0
mail_driver = maildir
mail_home = /var/spool/mail/%{user}
mail_path = /var/spool/mail/%{user}/dovecot
protocols {
  imap = yes
  lmtp = yes
  pop3 = yes
}
protocol imap {
  mail_plugins {
    quota = yes
    trash = yes
    imap_quota = yes
  }
}
protocol lda {
  mail_plugins {
    quota = yes
    sieve = yes
  }
}
protocol lmtp {
  mail_plugins {
    quota = yes
    sieve = yes
  }
}
protocol pop3 {
  mail_plugins {
    quota = yes
  }
}
service imap-login {
  inet_listener imap {
    port = 143
    listen = 127.0.0.1
  }
  inet_listener imaps {
    port = 993
    listen = 127.0.0.1
  }
}
service managesieve-login {
  inet_listener sieve {
    listen = 127.0.0.1
  }
}
service pop3-login {
  inet_listener pop3 {
    port = 110
    listen = 127.0.0.1
  }
  inet_listener pop3s {
    port = 995
    listen = 127.0.0.1
  }
}
sieve_script personal {
  path = /var/spool/mail/%{user}/sieve/dovecot.sieve
}
namespace inbox {
  inbox = yes
  prefix =
  separator = /
  trash_priority = 0
  mailbox Drafts {
    auto = subscribe
    special_use = "\\Drafts"
#   trash_priority = 0
  }
  mailbox Junk {
    auto = subscribe
    special_use = "\\Junk"
    trash_priority = 1
  }
  mailbox Sent {
    auto = subscribe
    special_use = "\\Sent"
#   trash_priority = 0
  }
  mailbox Trash {
    auto = subscribe
    special_use = "\\Trash"
    trash_priority = 2
  }
}
ssl_server {
  cert_file = /etc/dovecot/fullchain.pem
  key_file = /etc/dovecot/privkey.pem
}
passdb pam {
  driver = pam
}
userdb passwd {
  driver = passwd
}
userdb prefetch {
  driver = prefetch
}
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