test_bug2038465.html

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<meta charset=utf-8>

<head>

  <title>Test for Bug 2038465 - FLAC with varying per-frame channel count must not leak ASan-poisoned heap</title>

  <script src="/tests/SimpleTest/SimpleTest.js"></script>

  <script src="webaudio_asan_fill.js"></script>

  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />

</head>

<body>

<pre id="test">

<script class="testbody" type="text/javascript">

SimpleTest.waitForExplicitFinish();

// Verify ASan's fill configuration before scanning the decoded samples.

async function runTest() {

  if (!asanVerifyFillOptions()) {

    SimpleTest.finish();

    return;

  const resp = await fetch("bug2038465_varying_channels.flac");

  const buf = await resp.arrayBuffer();

  const ctx = new OfflineAudioContext(2, 44100, 44100);

  const decoded = await ctx.decodeAudioData(buf);

  is(decoded.numberOfChannels, 2,

     "decoded.numberOfChannels matches max per-packet channel count");

  is(decoded.length, 44100,

     "decoded.length matches total FLAC frame samples");

  is(decoded.sampleRate, 44100,

     "decoded.sampleRate matches FLAC STREAMINFO");

  for (let c = 0; c < decoded.numberOfChannels; ++c) {

    const { count, firstIndex } = asanCountFillSentinel(decoded.getChannelData(c));

    is(count, 0,

       `channel ${c}: ASan malloc-fill bytes leaked to JS - ` +

       `first bad at index ${firstIndex}`);

  SimpleTest.finish();

runTest().catch(e => {

  ok(false, "Unexpected exception: " + e);

  SimpleTest.finish();

});

</script>

</pre>

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