zlib: gracefully set windowBits from 8 to 9

On 4 April 2017, Node.js versions v4.8.2 and v6.10.2 were
released. These versions bumped the vendored zlib library from
v1.2.8 to v1.2.11 in response to what it describes as low-severity
CVEs. In zlib v1.2.9, a change was made that causes an error to be
raised when a raw deflate stream is initialised with windowBits set
to 8.

In zlib v1.2.9, 8 become an invalid value for this parameter, and Node's zlib
module will crash if you call this:

```
zlib.createDeflateRaw({windowBits: 8})
```

On some versions this crashes Node and you cannot recover from it, while on some
versions it throws an exception. The permessage-deflate library up to
version v0.1.5 does make such a call with no try/catch

This commit reverts to the original behavior of zlib by gracefully changed
windowBits: 8 to windowBits: 9 for raw deflate streams.

Original-PR-URL: https://github.com/nodejs-private/node-private/pull/95
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: Sam Roberts <vieuxtech@gmail.com>

PR-URL: https://github.com/nodejs/node/pull/16511
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>

1 files changed, 0 insertions, 17 deletions

diff --git a/test/parallel/test-zlib-failed-init.js b/test/parallel/test-zlib-failed-init.js
index 7dd53ea370..5bbd64426a 100644
--- a/test/parallel/test-zlib-failed-init.js
+++ b/test/parallel/test-zlib-failed-init.js
@@ -5,23 +5,6 @@ const common = require('../common');
 const assert = require('assert');
 const zlib = require('zlib');
 
-// For raw deflate encoding, requests for 256-byte windows are rejected as
-// invalid by zlib (http://zlib.net/manual.html#Advanced).
-// This check was introduced in version 1.2.9 and prior to that there was
-// no such rejection which is the reason for the version check below
-// (http://zlib.net/ChangeLog.txt).
-if (!/^1\.2\.[0-8]$/.test(process.versions.zlib)) {
-  common.expectsError(
-    () => zlib.createDeflateRaw({ windowBits: 8 }),
-    {
-      code: 'ERR_ZLIB_INITIALIZATION_FAILED',
-      type: Error,
-      message: 'Initialization failed'
-    });
-}
-
-// Regression tests for bugs in the validation logic.
-
 common.expectsError(
   () => zlib.createGzip({ chunkSize: 0 }),
   {