[sync] Infinite loop in Horde/Icalendar.php when syncing

[Carsten Schumann]

Hi guys,

I have reinstalled my horde webmail since I had to upgrade from webmail 
1.2.4 to 4.0.2 for my new Ipad. The web frontend works fine but when I 
try to sync my mobile phone against kronolith, apache ends up in an 
infinite loop in Horde/Icalendar.php:584 while trying to parse the 
answer from my phone.

The loop reads:

         while 
(preg_match_all('/^([^:]+;\s*(ENCODING=)?QUOTED-PRINTABLE(.*=\r?\n)+(.*[^=])?(\r?\n|$))/mU', 
$vCal, $matches)) {
             foreach ($matches[1] as $s) {
                 $r = preg_replace('/=\r?\n\s/', '', $s);
                 $vCal = str_replace($s, $r, $vCal);
             }
         }


$vCal has the value

X-IRMC-LUID:3422981680^M CATEGORIES:Memo^M 
SUMMARY;CHARSET=UTF-8;ENCODING=QUOTED-PRINTABLE:Feuerwehr:=20Baumaktion=20Au=^M 
fr=C3=A4umen^M DTSTART:20071201T100000Z^M DTEND:20071201T120000Z

and after the preg_match_all instruction, $matches[1] contains an array 
with one element

SUMMARY;CHARSET=UTF-8;ENCODING=QUOTED-PRINTABLE:Feuerwehr:=20Baumaktion=20Au=^M 
fr=C3=A4umen^M

which is not altered by the preg_replace expression. As $r==$s nothing 
is altered by str_replace expression in $vCal. So the preg_match_all 
matches again and again and again... ;-)

Is this issue known and is there a bugfix/workaround?

Best regards,
Carsten