Backport to fix iTXt chunk handling for pngs

[Pavel Tisnovsky]

Deepak Bhole wrote:
> 
> Here is the updated patchset for HEAD, 1.7, 1.8 and 1.9. It contains the
> OOM patch + ChangeLog and NEWS entries.
> 
> I've tested all 4 builds and they fix the issue.
> 
> Cheers,
> Deepak
> 

Hi Deepak,

it looks good from my perspective. I've run reproducer attached to
https://bugzilla.redhat.com/show_bug.cgi?id=665355 against patched
IcedTea6 HEAD and your changes really fix this issue ;-)

FYI: I'm going to use this reproducer to create regression test (not
using URL-connection and not using /probably/ copyrighted PNG images, of
course)

Cheers,
Pavel