mutt/2163: Mutt crashes on malformed "From:" header (quoted-printable)

[vincent@xxxxxxxxxx]

>Number:         2163
>Notify-List:    
>Category:       mutt
>Synopsis:       Mutt crashes on malformed "From:" header (quoted-printable)
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    mutt-dev
>State:          open
>Keywords:       
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Jan 14 18:45:12 +0100 2006
>Originator:     vincent@xxxxxxxxxx
>Release:        cvs + patches
>Organization:
>Environment:
Mac OS X
>Description:
Mutt crashes on a maildir (see attached file) containing a message with only:

  From: =?iso-8859-1?Q??= <konateaicha@xxxxxxxxxxx>

(this comes from a spam). The .muttdebug0 file says:

[...]
mh.c:760 maildir_add_to_context(): Considering 
mh.c:769 Adding header structure. Flags:
>How-To-Repeat:
>Fix:
Unknown
>Add-To-Audit-Trail:

>Unformatted:
 ----gnatsweb-attachment----
 Content-Type: application/x-gzip; name="crash.tar.gz"
 Content-Transfer-Encoding: base64
 Content-Disposition: attachment; filename="crash.tar.gz"
 
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 9E0ok9DWN4uFgv9jvP99vZ/J/y9Gju8/4/8HAAAAAAAAAAAAAAAAAPiRN0mCV0sAKAAA