Re: Problems after upgrading to libtiff 4.0.7

On 11/30/2016 05:55 AM, Michael Brunnbauer wrote:
> after the upgrade to libtiff 4.0.7, all outgoing faxes successfully sent are
> received as garbage by the other side (header missing, some stripes on the
> right side for cover sheet and fax - otherwise empty page). Downgrading to
> 4.0.6 solves the problem but 4.0.7 has important security fixes.

I can confirm a lot of problems in using HylaFAX with libtiff 4.0.7.

It's going to take some time to get to the bottom of it.  There are a 
lot of involved changes between libtiff 4.0.6 and 4.0.7, and if finding 
the problem ultimately requires stepping through the various libtiff 
commits then it could be a rather lengthy process.

Once the problem is identified we will be able to determine if the fault 
is in HylaFAX or in libtiff.  If it is in libtiff (which is likely the 
case since it's the one that "moved") then you'll never be able to use 
stock 4.0.7, anyway, as you'll need to patch it.

Unfortunately, the libtiff development code really never gets tested 
extremely thoroughly until after a release.  Consequently, we sometimes 
see regressions in libtiff releases.  Normally I do make an effort to 
test the libtiff release candidates with HylaFAX, but I've not been able 
to do that lately.

Thanks,

Lee.


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