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src: fix invalid windowBits=8 gzip segfault #33045

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src: fix invalid windowBits=8 gzip segfault #33045

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9436534
src: fix invalid windowBits=8 gzip segfault
bnoordhuis Apr 24, 2020
1cec86e
zlib: reject windowBits=8 when mode=GZIP
bnoordhuis Apr 24, 2020
4de03b1
fixup! zlib: reject windowBits=8 when mode=GZIP
addaleax May 7, 2020
40da66d
fixup! src: fix invalid windowBits=8 gzip segfault
addaleax May 7, 2020
61b08c3
fixup! zlib: reject windowBits=8 when mode=GZIP
addaleax May 8, 2020
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4 changes: 3 additions & 1 deletion lib/zlib.js
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Expand Up @@ -613,9 +613,11 @@ function Zlib(opts, mode) {
mode === UNZIP)) {
windowBits = 0;
} else {
// `{ windowBits: 8 }` is valid for deflate but not gzip.
const min = Z_MIN_WINDOWBITS + (mode === GZIP ? 1 : 0);
windowBits = checkRangesOrGetDefault(
opts.windowBits, 'options.windowBits',
Z_MIN_WINDOWBITS, Z_MAX_WINDOWBITS, Z_DEFAULT_WINDOWBITS);
min, Z_MAX_WINDOWBITS, Z_DEFAULT_WINDOWBITS);
}

level = checkRangesOrGetDefault(
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9 changes: 7 additions & 2 deletions src/node_zlib.cc
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Expand Up @@ -111,7 +111,12 @@ enum node_zlib_mode {

struct CompressionError {
CompressionError(const char* message, const char* code, int err)
: message(message), code(code), err(err) {}
: message(message),
code(code),
err(err) {
CHECK_NOT_NULL(message);
}

CompressionError() = default;

const char* message = nullptr;
Expand Down Expand Up @@ -997,7 +1002,7 @@ CompressionError ZlibContext::Init(
if (err_ != Z_OK) {
dictionary_.clear();
mode_ = NONE;
return ErrorForMessage(nullptr);
return ErrorForMessage("zlib error");
}

return SetDictionary();
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2 changes: 1 addition & 1 deletion test/parallel/test-zlib-failed-init.js
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Expand Up @@ -21,7 +21,7 @@ assert.throws(
code: 'ERR_OUT_OF_RANGE',
name: 'RangeError',
message: 'The value of "options.windowBits" is out of range. It must ' +
'be >= 8 and <= 15. Received 0'
'be >= 9 and <= 15. Received 0'
}
);

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2 changes: 1 addition & 1 deletion test/parallel/test-zlib-zero-windowBits.js
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Expand Up @@ -28,6 +28,6 @@ const zlib = require('zlib');
code: 'ERR_OUT_OF_RANGE',
name: 'RangeError',
message: 'The value of "options.windowBits" is out of range. ' +
'It must be >= 8 and <= 15. Received 0'
'It must be >= 9 and <= 15. Received 0'
});
}
8 changes: 8 additions & 0 deletions test/parallel/test-zlib.js
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Expand Up @@ -27,6 +27,14 @@ const stream = require('stream');
const fs = require('fs');
const fixtures = require('../common/fixtures');

// Should not segfault.
assert.throws(() => zlib.gzipSync(Buffer.alloc(0), { windowBits: 8 }), {
code: 'ERR_OUT_OF_RANGE',
name: 'RangeError',
message: 'The value of "options.windowBits" is out of range. ' +
'It must be >= 9 and <= 15. Received 8',
});

let zlibPairs = [
[zlib.Deflate, zlib.Inflate],
[zlib.Gzip, zlib.Gunzip],
Expand Down