[Dovecot] Sieve segfault on sieve-before scripts

[Stephan Bosch]

Max Ivanov wrote:
> I use dovecot 1.2.4 release with sieve 0.1.12
> 
> If I setup sieve-before script and latest script contains "keep" at
> the very end and no personal scripts found then segfault take place.
> 
> here is part of exim log:
> 2009-09-01 18:43:06 1MiUZA-0005V9-IB ** ivanov_maxim at domain.my
> <admin at domain.my> R=localuser T=local_delivery: Child process of
> local_delivery transport (running command
> "/usr/libexec/dovecot/deliver -d $local_part") was terminated by
> signal 11 (Segmentation fault)
> 
> 
> Once I remove "keep" from end of latest sieve-before script,
> everything goes fine.

Using the backtrace and scripts you provided I could reproduce and fix 
this bug:

http://hg.rename-it.nl/dovecot-1.2-sieve/rev/c26e7c2300b4

Apparently, I haven't tested the execution imap4flags very well in 
multiscript context when I last restructured the implementation; I found 
more related bugs when I fixed the one above:

http://hg.rename-it.nl/dovecot-1.2-sieve/rev/b62291ff5faf
http://hg.rename-it.nl/dovecot-1.2-sieve/rev/f3642d9934cf

The test suite is obviously in dire need of some multiscript support. 
I'll fix that before the next release to make sure this will not happen 
again.

Regards,

Stephan.