segfault in IMAP APPEND with compressed maildir

[Roland Rosenfeld]

Hi Aki!

On Tue, 07 Jun 2016, Aki Tuomi wrote:

> >> After upgrading from Debian wheezy with (self compiled) dovecot 2.2.15
> >> to Debian jessie with (self compiled) 2.2.24, I observe the following
> >> segmentation fault in the logs:
> >>
> >> Jun  7 09:23:09 imap dovecot: imap(user at example.com): Error: read(<imap client>) failed: read(size=8003) failed: Connection reset by peer (uid=0, box=trash)
> >> Jun  7 09:23:09 imap dovecot: imap(user at example.com): Error: zlib.read(/srv/mailstore/user at example.com/mail/.trash/tmp/1465283884.M336492P22902.imap): unexpected EOF at 88001
> >> Jun  7 09:23:09 imap dovecot: imap(user at example.com): Error: read(zlib(/srv/mailstore/user at example.com/mail/.trash/tmp/1465283884.M336492P22902.imap)) failed: read(/srv/mailstore/user at example.com/mail/.trash/tmp/1465283884.M336492P22902.imap) failed: zlib.read(/srv/mailstore/user at example.com/mail/.trash/tmp/1465283884.M336492P22902.imap): unexpected EOF at 88001 (uid=0, box=trash)
> >> Jun  7 09:23:09 imap dovecot: imap(user at example.com): Fatal: master: service(imap): child 22902 killed with signal 11 (core dumped)
> >>
> >> We also observed the same (rare) error in the past on the old system.
> >> But on the old system, there were only the first 3 lines without the
> >> segmentation fault, so we ignored the issue until now.

> Sorry I mean
> https://github.com/dovecot/core/commit/6bc001ee9dc03cb3107239861867cd674fd321d7

Many thanks!  This really fixed the Segfault.  After applying this
patch on 2.2.24, the Segfault disappeared while the above Error
messages stayed (as known from 2.2.15).

Tschoeeee

        Roland