(wrong-type-argument wholenump nil) [mu4e bug]

[ndw]

Describe the bug

If I attempt to view the message included below, I get this stack trace:

Debugger entered--Lisp error: (wrong-type-argument wholenump nil)
  mail-decode-encoded-word-region(32 454)
  article-decode-encoded-words()
  run-hooks(gnus-article-decode-hook)
  mu4e--view-render-buffer((:path "/Users/ndw/Maildir/ExampleCorp/INBOX/cur/problem-mess..." :size 747 :changed (25877 38006 0) :date (25874 32443 0) :flags (seen) :from ((:email "you@example.org" :name "You")) :message-id "SOMETHINGELSEWASHERE.eurprd07.prod.outlook.com" :priority normal :subject "THIS IS THE PROBLEM MESSAGE" :to ((:email "me@example.org")) :maildir "/ExampleCorp/INBOX" :docid 207679 :meta (:path "0d7:z" :level 0 :date "n65127ebb" :data-tstamp (0 0 0) :root t :thread-subject t)))
  mu4e-view((:path "/Users/ndw/Maildir/ExampleCorp/INBOX/cur/problem-mess..." :size 747 :changed (25877 38006 0) :date (25874 32443 0) :flags (seen) :from ((:email "you@example.org" :name "You")) :message-id "SOMETHINGELSEWASHERE.eurprd07.prod.outlook.com" :priority normal :subject "THIS IS THE PROBLEM MESSAGE" :to ((:email "me@example.org")) :maildir "/ExampleCorp/INBOX" :docid 207679 :meta (:path "0d7:z" :level 0 :date "n65127ebb" :data-tstamp (0 0 0) :root t :thread-subject t)))
  mu4e~headers-view-handler((:path "/Users/ndw/Maildir/ExampleCorp/INBOX/cur/problem-mess..." :size 747 :changed (25877 38006 0) :date (25874 32443 0) :flags (seen) :from ((:email "you@example.org" :name "You")) :message-id "SOMETHINGELSEWASHERE.eurprd07.prod.outlook.com" :priority normal :subject "THIS IS THE PROBLEM MESSAGE" :to ((:email "me@example.org")) :maildir "/ExampleCorp/INBOX" :docid 207679 :meta (:path "0d7:z" :level 0 :date "n65127ebb" :data-tstamp (0 0 0) :root t :thread-subject t)))
  mu4e--server-filter(#<process  *mu4e-server*> "\37618b\377(:view (:path \"/Users/ndw/Maildir/ExampleCorp/IN...")

How to Reproduce

Put the message below into your Maildir and try to view it.

Environment

Emacs 29.1 on macOS Ventura.

Checklist

• you are running either an 1.8.x/1.10.x release or master (otherwise please upgrade)
• you can reproduce the problem without 3rd party extensions (including Doom/Evil, various extensions etc.)
• you have read all of the above

Please make sure you all items in the checklist are set/met before filing the ticket. Thank you!

Here's the smallest message I could construct that reproduced the problem.

Return-Path: <you@example.org>
ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none;
 b=h8saLk8Cmxhn+nvprp0wReN0oICRSsmmMVpR/Xn3Ccd93md41DRmKc571vhbl+rDpeq1ACaeRUGH2OJg/uQywOOhPBcQfPju0foqoB7Ww05z7GauJXRC8Z9pII1EBEFoCHKg9cAoiI7LTb8Yfa9KWdC6J/ioOzS0F3g3VTm4Q4GLFeYWPQY9a8HzDP6RebF4K4ZkGrCwa3kSDgAAXEgP6r0R212IHSiXbzCXhlrPB17M8UJYT0yo+200lDhG7MLspwB2Y0pdFtf2PAIbI3y8qpR0YJiyHhTn+q6g80Z5QvDRUBH7Lgs9iBJAvhX3O/LSxnzlw/a0gKGWR7pu8mPViA==
From: You <you@example.org>
To: me@example.org
Subject: THIS IS THE PROBLEM MESSAGE
Date: Tue, 26 Sep 2023 06:48:27 +0000
Message-ID:
 <SOMETHINGELSEWASHERE.eurprd07.prod.outlook.com>
Content-Type: text/plain; charset="utf-7"
Content-Transfer-Encoding: quoted-printable

Some message goes here

The problem appears to be in the ARC-Seal header. I won't be surprised if you conclude that it's encoded incorrectly, but since we discussed it in email, I thought I'd complete the loop and open the report.

Thanks for your help!

[djcb]

Thanks! I can reproduce. I have a fix (workaround) for the development branch, and I'll backport it to 10.x.

[eslgastal]

Hello @djcb . Was this fix backported to 1.10 ?

[djcb]

@eslgastal: I've just done so.