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zlib: prevent uncaught exception in zlibBuffer #1811

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targos wants to merge 3 commits into from
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zlib: prevent uncaught exception in zlibBuffer #1811

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4692e75
zlib: prevent uncaught exception in zlibBuffer
targos May 27, 2015
ce770de
check size in zlib
targos Jun 4, 2015
6970045
add regression test
targos Jun 5, 2015
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check size in zlib
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@targos
targos committed Jun 4, 2015
commit ce770de20f3ebbc74274fb405981935b8653a3c4
16 changes: 13 additions & 3 deletions lib/zlib.js
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,9 @@ const Transform = require('_stream_transform');
const binding = process.binding('zlib');
const util = require('util');
const assert = require('assert').ok;
const kMaxLength = process.binding('smalloc').kMaxLength;
const kRangeErrorMessage = 'Cannot create final Buffer. ' +
'It would be larger than 0x' + kMaxLength.toString(16) + ' bytes.';

// zlib doesn't provide these, so kludge them in following the same
// const naming scheme zlib uses.
Expand Down Expand Up @@ -211,11 +214,13 @@ function zlibBuffer(engine, buffer, callback) {
function onEnd() {
var buf;
var err = null;
try {

if (nread >= kMaxLength) {
err = new RangeError(kRangeErrorMessage);
} else {
buf = Buffer.concat(buffers, nread);
} catch (e) {
err = e;
}
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@cjihrig cjihrig May 27, 2015

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Could you do something more like:

err = null;

try {
  buf = Buffer.concat(buffers, nread);
} catch (e) {
  err = e;
}

buffers = [];
engine.close();
callback(err, buf);

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@targos targos May 27, 2015

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done


buffers = [];
engine.close();
callback(err, buf);
Expand Down Expand Up @@ -531,6 +536,11 @@ Zlib.prototype._processChunk = function(chunk, flushFlag, cb) {
throw error;
}

if (nread >= kMaxLength) {
this.close();
throw new RangeError(kRangeErrorMessage);
}

var buf = Buffer.concat(buffers, nread);
this.close();

Expand Down