From 58a980141be5d4323cd8ba18f1e285cb25c9d547 Mon Sep 17 00:00:00 2001 From: Matteo Collina Date: Tue, 6 Feb 2024 16:47:20 +0100 Subject: [PATCH] zlib: pause stream if outgoing buffer is full MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Matteo Collina PR-URL: https://github.com/nodejs-private/node-private/pull/540 Reviewed-By: Robert Nagy Ref: https://hackerone.com/reports/2284065 CVE-ID: CVE-2024-22025 Signed-off-by: Jan Staněk Signed-off-by: rpm-build --- lib/zlib.js | 33 +++++++++++++++++++------- test/parallel/test-zlib-brotli-16GB.js | 22 +++++++++++++++++ test/parallel/test-zlib-params.js | 24 ++++++++++++------- 3 files changed, 62 insertions(+), 17 deletions(-) create mode 100644 test/parallel/test-zlib-brotli-16GB.js diff --git a/lib/zlib.js b/lib/zlib.js index 9bde199..efe77bc 100644 --- a/lib/zlib.js +++ b/lib/zlib.js @@ -560,10 +560,11 @@ function processCallback() { self.bytesWritten += inDelta; const have = handle.availOutBefore - availOutAfter; + let streamBufferIsFull = false; if (have > 0) { const out = self._outBuffer.slice(self._outOffset, self._outOffset + have); self._outOffset += have; - self.push(out); + streamBufferIsFull = !self.push(out); } else { assert(have === 0, 'have should not go down'); } @@ -588,13 +589,29 @@ function processCallback() { handle.inOff += inDelta; handle.availInBefore = availInAfter; - this.write(handle.flushFlag, - this.buffer, // in - handle.inOff, // in_off - handle.availInBefore, // in_len - self._outBuffer, // out - self._outOffset, // out_off - self._chunkSize); // out_len + + if (!streamBufferIsFull) { + this.write(handle.flushFlag, + this.buffer, // in + handle.inOff, // in_off + handle.availInBefore, // in_len + self._outBuffer, // out + self._outOffset, // out_off + self._chunkSize); // out_len + } else { + const oldRead = self._read; + self._read = (n) => { + self._read = oldRead; + this.write(handle.flushFlag, + this.buffer, // in + handle.inOff, // in_off + handle.availInBefore, // in_len + self._outBuffer, // out + self._outOffset, // out_off + self._chunkSize); // out_len + self._read(n); + }; + } return; } diff --git a/test/parallel/test-zlib-brotli-16GB.js b/test/parallel/test-zlib-brotli-16GB.js new file mode 100644 index 0000000..ba4f7ef --- /dev/null +++ b/test/parallel/test-zlib-brotli-16GB.js @@ -0,0 +1,22 @@ +'use strict'; + +const common = require('../common'); +const { createBrotliDecompress } = require('node:zlib'); +const strictEqual = require('node:assert').strictEqual; + +// This tiny HEX string is a 16GB file. +// This test verifies that the stream actually stops. +/* eslint-disable max-len */ +const content = 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+ +const buf = Buffer.from(content, 'hex'); + +const decoder = createBrotliDecompress(); +decoder.end(buf); + +// We need to wait to verify that the libuv thread pool had time +// to process the data and the buffer is not empty. +setTimeout(common.mustCall(() => { + // There is only one chunk in the buffer + strictEqual(decoder._readableState.buffer.length, 1); +}), common.platformTimeout(100)); diff --git a/test/parallel/test-zlib-params.js b/test/parallel/test-zlib-params.js index 30d4f13..18271fe 100644 --- a/test/parallel/test-zlib-params.js +++ b/test/parallel/test-zlib-params.js @@ -12,23 +12,29 @@ const deflater = zlib.createDeflate(opts); const chunk1 = file.slice(0, chunkSize); const chunk2 = file.slice(chunkSize); const blkhdr = Buffer.from([0x00, 0x5a, 0x82, 0xa5, 0x7d]); -const expected = Buffer.concat([blkhdr, chunk2]); -let actual; +const blkftr = Buffer.from('010000ffff7dac3072', 'hex'); +const expected = Buffer.concat([blkhdr, chunk2, blkftr]); +const bufs = []; + +function read() { + let buf; + while ((buf = deflater.read()) !== null) { + bufs.push(buf); + } +} deflater.write(chunk1, function() { deflater.params(0, zlib.constants.Z_DEFAULT_STRATEGY, function() { while (deflater.read()); - deflater.end(chunk2, function() { - const bufs = []; - let buf; - while ((buf = deflater.read()) !== null) - bufs.push(buf); - actual = Buffer.concat(bufs); - }); + + deflater.on('readable', read); + + deflater.end(chunk2); }); while (deflater.read()); }); process.once('exit', function() { + const actual = Buffer.concat(bufs); assert.deepStrictEqual(actual, expected); }); -- 2.44.0