[Bug 1692870] [NEW] gzip compression broken in UniFi (built-in tomcat)

Launchpad Bug Tracker 1692870 at bugs.launchpad.net
Tue May 23 12:28:54 UTC 2017


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[Impact] 
Since I upgraded from Ubuntu 16.10 to 17.04, my Guest portal for my UniFi system was broken (https://www.ubnt.com/download/unifi/).

Curl gave me the following response:
# curl -vvvv --compress localhost:8880/guest/s/default/
*   Trying ::1...
* TCP_NODELAY set
* Connected to localhost (::1) port 8880 (#0)
> GET /guest/s/default/ HTTP/1.1
> Host: localhost:8880
> User-Agent: curl/7.52.1
> Accept: */*
> Accept-Encoding: deflate, gzip
>
< HTTP/1.1 200 OK
< Server: Apache-Coyote/1.1
< Content-Type: text/html;charset=utf-8
< Transfer-Encoding: chunked
< Content-Encoding: gzip
< Vary: Accept-Encoding
< Date: Tue, 23 May 2017 11:19:22 GMT
<
* Error while processing content unencoding: invalid code lengths set
* Failed writing data
* Curl_http_done: called premature == 1
* Closing connection 0
curl: (23) Error while processing content unencoding: invalid code lengths set

[Test Case]
Just install a fresh Ubuntu 17.04 with UniFi controller. And the Guest Portal is broken. See above.
When disabling compression in curl, it works fine.

After some debugging, I found out that downgrading to zlib 1:1.2.8.dfsg-
2ubuntu5.1 was a workaround.

Now after digging into the issue some more, I found the following upstream patch (unreleased version), fixes the issue:
https://github.com/madler/zlib/commit/f9694097dd69354b03cb8af959094c7f260db0a1

[Regression Potential]
Everybody upgrading from 16.10 (or previous) to 17.04 will be affected by this.

The patch is taken from upstream, so this isn't a change we will need to
keep different from upstream.

I've already created a new package (see debdiff) that fixes the issue.

[Other Info]
Now as the UniFi controller is just some Tomcat, which relies on Java (OpenJDK), which uses zlib for its built-in Compression/Decompression. I guess even more java related tools can be broken. But I didn't have time to test this.

At least some other people using UniFi have the same issue, see:
https://community.ubnt.com/t5/UniFi-Wireless/ERR-CONTENT-DECODING-FAILED-on-guest-portal-customisation/td-p/1903419

** Affects: zlib (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: patch
-- 
gzip compression broken in UniFi (built-in tomcat)
https://bugs.launchpad.net/bugs/1692870
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