[dovecot/core] 5c1837: lib-mail: mail-html2text - Validate UCS4 codepoint

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/dovecot/core
  Commit: 5c1837529e6957da3e389683c43bd006859395e5
      https://github.com/dovecot/core/commit/5c1837529e6957da3e389683c43bd006859395e5
  Author: Aki Tuomi <aki.tuomi at dovecot.fi>
  Date:   2018-01-10 (Wed, 10 Jan 2018)

  Changed paths:
    M src/lib-mail/mail-html2text.c
    M src/lib-mail/test-mail-html2text.c

  Log Message:
  -----------
  lib-mail: mail-html2text - Validate UCS4 codepoint

Fixes: Panic: file unichar.c: line 160 (uni_ucs4_to_utf8_c): assertion failed: (uni_is_valid_ucs4(chr))